Thai Poached Lentils in Coconut Curry Broth (Keang Lentils)

Balance is everything. Thai cooking understands this in its bones — taste and adjust. This poached lentils is a perfect example of that philosophy in action. Every element in this dish has a purpose. The heat wakes you up. The herbs cool you down. The fish sauce grounds everything. Together, they create harmony on the plate. Fresh herbs are life.

Ingredients

For the Red Curry Paste

4-6 Thai bird's eye chilies (seeds removed for less heat)

2 tablespoons fresh galangal, sliced thinly (approximately 1-inch piece)

2 stalks fresh lemongrass, tender white and pale green parts only, chopped (approximately ½ cup)

3 cloves fresh garlic

1 small shallot (approximately 40g), chopped

1 tablespoon shrimp paste (kapi, optional but strongly recommended for depth)

1 tablespoon coriander seeds

½ teaspoon cumin seeds

¼ teaspoon white pepper

2 tablespoons fish sauce (nam pla)

2 tablespoons coconut oil or vegetable oil

For Poaching the Lentils

1½ cups red lentils (or brown lentils for heartier texture), rinsed thoroughly

1 can (400ml) full-fat coconut milk, divided

2 cups vegetable or light chicken stock

2 tablespoons fish sauce (nam pla)

1 tablespoon palm sugar

1½ teaspoons sea salt

1 teaspoon tamarind paste concentrate

½ teaspoon white pepper

For Aromatics and Finish

2 cups fresh spinach or Thai basil (bai krapow)

3 kafir lime leaves, torn

1 tablespoon fresh lime juice

2 green onions, chopped

Fresh cilantro leaves

Thai red chilies, sliced thinly (for garnish)

Crispy fried shallots (optional, for garnish)

Equipment Needed

Large heavy-bottomed pot (4-5 quarts)

Medium saucepan (for curry paste preparation)

Mortar and pestle (or spice grinder for seed toasting)

Fine mesh strainer

Measuring cups and spoons

Wooden spoon for stirring

Cutting board and sharp knife

Ladle

Serving bowls

Blender or food processor (if making curry paste without mortar and pestle)

Instructions

Step 1: Toast and Grind Spice Seeds (5 minutes)

In a dry heavy-bottomed pot over medium heat, add the coriander seeds and cumin seeds. Stir constantly with a wooden spoon for 2-3 minutes until fragrant and lightly darkened.

Listen for the subtle toasting aromas—coriander becomes sweet and floral, cumin develops nutty notes. Stop when you smell the oils releasing but before seeds darken significantly (medium brown at most).

Transfer the toasted seeds to a mortar and pestle and grind until mostly broken (not a powder—some texture is desirable). Set aside.

The grinding releases additional volatile oils that intensify the flavor profile. This step is crucial for authentic depth.

Step 2: Prepare Aromatics for Paste (10 minutes)

Slice the galangal thinly, removing any tough skin. Galangal is firmer than ginger and requires more aggressive slicing to help the mortar break it down.

Cut the lemongrass stalks into 1-inch pieces, crush lightly with the side of your knife to help release oils, then chop finely into approximately ½ cup. This releases aromatic compounds needed for the paste.

Peel and roughly chop the garlic cloves.

Roughly chop the shallot into pieces approximately ½ inch each.

Remove seeds from the Thai chilies if you prefer less heat (the green interior is less spicy than the seeds). Chop roughly.

Arrange all prepared aromatics on your cutting board in small piles for easy access to the mortar and pestle.

Step 3: Create the Red Curry Paste (8 minutes)

Using a mortar and pestle (the traditional method), begin with the toasted coriander and cumin seeds. Grind them further into a fine powder, releasing more of their oils.

Add the shrimp paste (kapi) and work it into the seeds with the pestle, using a circular grinding motion for about 1 minute. The shrimp paste adds umami and depth that's difficult to replicate.

Add the garlic cloves and crush against the mortar bottom repeatedly until broken down to fine pieces (approximately 2 minutes).

Add the galangal pieces and repeat the crushing and grinding action for 2 minutes. Galangal's firm texture requires patience—keep pressing.

Add the lemongrass and shallot. The mortar should be increasingly full. Grind and crush for 2 minutes until the mixture becomes fragrant and slightly pasty.

Add the chopped Thai chilies and continue grinding for 1 minute, incorporating them fully.

Add the white pepper and salt and mix thoroughly.

The final paste should be chunky but cohesive, with no large pieces remaining. It should smell intensely aromatic—citrusy from lemongrass, peppery from galangal, spicy-floral from chilies, funky-deep from shrimp paste.

Step 4: Heat and Temper the Curry Paste (3 minutes)

Heat 2 tablespoons coconut oil in a large heavy-bottomed pot over medium-low heat until shimmering.

Transfer the entire curry paste from the mortar to the hot oil. Listen for a gentle sizzle—if the oil is too cool, the paste steams; if too hot, it burns.

Stir continuously with a wooden spoon for 3-4 minutes, allowing the paste to "toast" in the oil. This crucial step blooms the dried spices and develops deeper, more complex flavors.

The paste will darken slightly and smell increasingly fragrant. You're looking for a rich, deep aroma—not acrid or burnt.

Step 5: Introduce Coconut Milk (4 minutes)

Pour approximately ½ can (200ml) of the coconut milk into the pot with the toasted paste. Stir immediately and vigorously for 30 seconds.

This initial addition creates an emulsion that's crucial to the sauce. The coconut milk calms the heat of the paste while dissolving it into a cohesive sauce.

Add 2 tablespoons fish sauce and 1 tablespoon palm sugar. Stir well to combine completely.

The mixture should smell deeply savory-sweet, with balanced heat starting to emerge.

Continue cooking for 2 minutes, stirring frequently. The sauce should darken slightly as the spices continue to release oils into the coconut milk.

Step 6: Rinse and Add Lentils (2 minutes)

While the curry base develops, rinse the lentils thoroughly in a fine mesh strainer under cold running water for 1 minute. This removes starches that cause cloudiness and bitter flavors.

Stir the curry sauce once more, then add the rinsed lentils directly to the pot. Stir to coat all lentils with the curry mixture.

The lentils should be evenly distributed and partially submerged in the curry sauce.

Step 7: Add Stock and Begin Poaching (25-30 minutes)

Pour 2 cups of vegetable or light chicken stock into the pot. Increase the heat to medium-high.

Bring the mixture to a gentle boil (small bubbles breaking surface, not a rolling boil). This takes approximately 3-4 minutes.

Once boiling, reduce heat to medium-low, maintaining a gentle simmer. Stir occasionally with a wooden spoon.

The lentils should begin breaking down slightly after 10 minutes. Check texture at the 15-minute mark by removing a spoon of lentils and testing with a fork.

Continue simmering until the lentils are completely tender but not falling apart (approximately 20-25 minutes total). Lentils should retain their shape while being soft inside.

After 20 minutes of poaching, add the remaining coconut milk (200ml from the second half of the can). Stir well.

The sauce should be thick and creamy, coating a spoon. Lentils should be submerged in this rich broth.

Step 8: Final Seasoning and Aromatics (5 minutes)

Once lentils are tender, taste the broth and adjust seasonings. The flavor should be balanced: salty, sweet, spicy, and sour in equal measure.

Add additional fish sauce if too sweet (½ tablespoon at a time).

Add palm sugar or honey if too salty or spicy (½ tablespoon at a time).

Add tamarind paste concentrate (½ teaspoon) for sour brightness if needed.

Tear the kafir lime leaves directly into the pot (avoid the center vein if possible). These release aromatic oils.

Stir in the fresh lime juice (1 tablespoon) just before serving. Lime juice should be added very late to preserve its brightness.

If using fresh spinach, stir it in now. It will wilt in 1-2 minutes from the residual heat. If using Thai basil, add it as a garnish after plating.

Step 9: Plate and Garnish (3 minutes)

Ladle the poached lentils with their rich curry broth into serving bowls, ensuring each portion has plenty of broth and cooked lentils.

Top each bowl with chopped green onions.

Sprinkle fresh cilantro leaves generously over the top.

Arrange thin slices of fresh Thai red chilies on the surface for visual appeal and adjustable heat.

If desired, add a small handful of crispy fried shallots for textural contrast.

Serve immediately alongside jasmine rice or sticky rice for a complete meal.

Expert Tips

Lentil Selection Matters Greatly: Red lentils cook in 20-25 minutes and become quite soft, creating a creamy sauce. Brown lentils take 30-35 minutes and hold their shape better, resulting in a brothier dish. French green lentils (lentilles du Puy) maintain their texture beautifully but are less traditional in Thai cooking and take 35-40 minutes.

Shrimp Paste is Essential: While optional, shrimp paste (kapi) provides umami depth that's nearly impossible to replicate. A small amount (1 tablespoon) goes a long way. If you omit it, increase fish sauce to 2½ tablespoons to compensate.

Fresh Aromatics Make All the Difference: Using fresh galangal, lemongrass, and chilies rather than dried creates dramatically superior results. If fresh is unavailable, dried versions work but use only half the quantity as they're more concentrated.

The Mortar and Pestle is Worth the Effort: While a food processor speeds up the paste-making, the mortar and pestle creates a coarser paste with better texture and more pronounced individual flavors. The slight grittiness adds character.

Don't Rush the Browning Step: Toasting the curry paste in the hot oil develops deeper, more complex flavors that distinguish authentic Thai cooking from quick approximations. This 3-4 minute step cannot be skipped.

Lime Juice is the Final Note: Adding lime juice at the very end preserves its aromatic brightness. If cooked into the broth, lime becomes muted. Adjust its quantity based on taste preference after the first spoonful.

Variations

Thai Basil Lentil Curry (Keang Bai Krapow): Replace fresh spinach with Thai basil and add it after plating as a garnish. This creates a more aromatic, anise-scented version popular in Northern Thailand.

Green Curry Lentils (Keang Kiaw Wan Lentils): Substitute green chilies for red chilies in the paste, add 2-3 whole shallots (halved) during the poaching, and increase lemongrass to 3 stalks. Green curry is lighter, fresher, and popular in Central and Eastern Thai provinces.

Isaan-Style Spicy Lentils: Use 8-10 Thai chilies (seeds included) instead of 4-6 and add 1 tablespoon of fermented fish curry (nam pla wan). Increase fish sauce to 3 tablespoons and reduce palm sugar to ½ tablespoon. Top with crushed roasted peanuts and dried chilies. This Northeastern version is earthier and more aggressively spiced.

Slow-Cooker Version: After browning the curry paste and adding initial coconut milk and seasoning, transfer to a slow cooker with stock and lentils. Cook on low for 4-5 hours or high for 2-3 hours. This reduces active cooking time but may result in a thinner broth as less liquid evaporates.

Protein-Enriched Curry: Add 200g of cubed firm tofu, shrimp, or cooked chicken during the final 10 minutes of cooking. The tofu absorbs the curry broth beautifully, while shrimp or chicken adds alternative protein without overwhelming the delicate lentil flavors.

Storage Instructions

Refrigerator Storage: Thai lentil curry keeps exceptionally well. Store in an airtight container for up to 5 days. The flavors actually deepen as the components meld overnight. Reheat gently over low-medium heat, adding a splash of water or stock if the broth has thickened significantly. Freezer Storage: Freeze in airtight containers or freezer bags for up to 3 months. The lentils maintain their texture through freezing better than most legume dishes. Thaw overnight in the refrigerator and reheat gently on the stovetop. Reheating Instructions: Transfer frozen or refrigerated curry to a saucepan and heat over low-medium heat, stirring frequently for 5-8 minutes. If the broth is too thick, add ¼ cup of stock or water at a time until reaching desired consistency. Taste and adjust seasonings after reheating, as flavors can become muted. Make-Ahead Options: The curry paste can be made up to 3 days ahead and refrigerated in an airtight container. The completed dish can be made through step 7 (after adding the second portion of coconut milk) and refrigerated for up to 2 days before the final seasoning and aromatics are added.

Serving Suggestions

Traditional Thai Meal: Serve with jasmine rice and a fresh papaya salad (som tam) on the side

Noodle Bowl: Ladle over soft rice noodles for a warming, comforting one-bowl meal

Bread Accompaniment: Serve with crusty Thai bread or roti for dipping into the rich curry broth

Light Lunch: Serve in smaller portions as an appetizer before a grilled protein dish

Soup Course: Serve with extra broth for a Thai curry soup experience

Picnic-Ready: Pack in a thermos and serve alongside rice cakes and fresh vegetables for outdoor dining

Frequently Asked Questions

Q: Can I make this recipe entirely vegan? A: Yes, with modifications. Replace fish sauce with soy sauce or tamari (using slightly less), omit the shrimp paste, and ensure all other ingredients are plant-based. The dish will be slightly less umami-rich but still deeply flavorful. Many Thai restaurants now offer vegetarian versions using these substitutions. Q: What's the difference between poaching and boiling lentils? A: Poaching means simmering the lentils in an already-prepared flavorful liquid (in this case, curry broth). Boiling typically means cooking in plain water or stock without other ingredients. Poaching infuses lentils with flavor throughout cooking, whereas boiling leaves the interior neutral until dressed afterward. This recipe's poaching method results in more uniformly flavored lentils. Q: My lentils are too mushy. What went wrong? A: Red lentils break down easily with extended cooking, especially in acidic environments (like tamarind and lime juice). If adding these ingredients early, they accelerate breakdown. Solution: Add lentils with more water, reserve acidic ingredients for final seasoning, and reduce cooking time by 5 minutes if preferred firmer texture. Q: Can I use canned coconut milk instead of fresh? A: Canned full-fat coconut milk is exactly what this recipe uses and is excellent. However, avoid "lite" coconut milk as it lacks the richness and texture of full-fat versions. The 400ml cans are standard and convenient. If using fresh coconut milk, use approximately 800ml (1 can equivalent). Q: What if I can't find Thai-specific ingredients like galangal or lemongrass? A: Galangal can be replaced with fresh ginger in equal quantities, though the peppery warmth will be slightly different. Lemongrass has no true substitute—it's worth sourcing via Asian markets or online retailers. However, adding 1 tablespoon of fresh lime zest to the paste provides some citrus brightness if lemongrass is genuinely unavailable.

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Ingredient Substitution Guide

Whether you're working around dietary restrictions, allergies, or simply using what's available in your kitchen, these substitutions work well in this thai preparation:

Black beans: Drain and rinse canned black beans for a quick swap. They hold their shape better than lentils and add earthy sweetness.

Split peas (green or yellow): Cook time is similar. Split peas break down more, creating a creamier texture that works well in soups and stews.

Quinoa: Rinse thoroughly to remove bitterness. Quinoa cooks faster than lentils, so add it later in the cooking process.

Chickpeas (canned, drained): Roughly chop for a lentil-like texture in salads and grain bowls. Whole chickpeas work in soups and stews.

When substituting, always taste and adjust seasoning as you go. Different proteins and ingredients absorb and carry flavors differently, so what works perfectly with lentils may need tweaking with your substitute.

Common Mistakes to Avoid

Even experienced cooks stumble with poached lentils. Here are the pitfalls to watch for:

Not seasoning the poaching liquid: The liquid is your chance to infuse flavor. Add aromatics, salt, acid, and herbs generously since only some flavor transfers to the food.

Using too little liquid: Food should be fully submerged for even cooking. If pieces stick up above the liquid line, they cook unevenly and dry out on top.

Discarding the poaching liquid: That liquid is now a flavorful stock. Strain it and use it as a base for sauces, soups, or to cook grains. It adds depth that plain water cannot.

Letting the liquid boil: Poaching requires gentle heat with tiny bubbles barely breaking the surface. A rolling boil toughens proteins and creates a ragged texture.

Cooking at too high a temperature: Ideal poaching temperature is 160-180°F. Use a thermometer rather than visual cues, as even small temperature increases change the result dramatically.

Avoiding these common errors will dramatically improve your results. The difference between good and great often comes down to these small details that many cooks overlook.

Make-Ahead and Meal Prep Tips

This recipe is excellent for meal preparation. Here's how to get the most out of your batch cooking:

Refrigerator storage: 5-7 days in an airtight container. Lentils thicken considerably when stored. Add broth or water when reheating and stir frequently to prevent sticking and scorching.

Freezer storage: Up to 6 months. Green and black lentils hold their shape best for meal prep. Red lentils break down and are better for soups and dals that you'll reheat.

Batch cooking strategy: Cook a big pot of lentils at the start of the week. They're incredibly versatile — add to soups, salads, grain bowls, or serve as a side throughout the week.

Reheating for Best Results

The biggest mistake in meal prep is aggressive reheating that overcooks the protein. Lentils thicken considerably when stored. Add broth or water when reheating and stir frequently to prevent sticking and scorching. For packed lunches, consider bringing components separately and assembling fresh. The texture stays better when sauces and garnishes are added at eating time rather than stored together.

Seasonal Adaptations

Thai cooking balances flavors with seasonal awareness. Spring brings the mango harvest for fresh salads and sticky rice desserts alongside fragrant lemongrass at its most aromatic. Summer's intense heat calls for cooling som tum (papaya salad), refreshing tom yum with seasonal herbs, and coconut-based curries. Autumn means fresh galangal, kaffir lime leaves, and the rice harvest season. Winter brings milder temperatures perfect for rich northern Thai curries like khao soi. Adapting this recipe to the seasons doesn't just improve flavor — it often reduces cost since in-season produce is more abundant and affordable. Visit your local farmers' market for the freshest seasonal ingredients that will elevate this dish.

Scaling This Recipe

Need to feed more people or cooking for just yourself? Here's how to adjust:

Acid ingredients (citrus juice, vinegar) should be added conservatively when scaling up. Too much acid overwhelms other flavors more quickly than salt or spice.

When halving this recipe, keep cooking temperature the same but reduce time by about 25%. Less food means less thermal mass, so it heats through faster.

For doubling, use a larger vessel rather than cooking two batches when possible. Proteins cook more evenly in a single batch with proper spacing.

Seasoning does not scale linearly. When doubling, start with 1.5 times the seasoning and adjust to taste. When halving, use about 60% of the original amount.

As a general rule, taste frequently when scaling. Your palate is the best guide for getting the balance right at any batch size.

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*Published: December 20, 2025 | Last updated: January 19, 2026*