Thai Braised Fish Recipe - Pla Rad Prik (Crispy Fish in Sweet Chili Sauce)

Hot hot hot! That's what the vendor says when the braised fish comes off the wok. The wok sings — you can hear it from down the block, sizzling and smoking. Fast and fresh is the rule here. The wok waits for nobody, and neither does great Thai food. Get your ingredients ready, get your heat right, and go. Flavor won't wait for you.

Ingredients

For the Fish

| Ingredient | Amount | Preparation | Notes | |------------|--------|-------------|-------| | Whole fish (sea bass, snapper, or tilapia) | 1.5-2 lbs | Cleaned and scaled | Head and tail intact | | Fish sauce | 2 tablespoons | - | For marinating | | White pepper | 1 teaspoon | Ground | For marinating | | Rice flour | 1/2 cup | - | Creates crispier coating | | Tapioca starch | 1/4 cup | - | Mixed with rice flour | | Vegetable oil | 4-6 cups | For deep frying | High smoke point |

For the Sweet Chili Sauce (Rad Prik)

| Ingredient | Amount | Preparation | Notes | |------------|--------|-------------|-------| | Vegetable oil | 3 tablespoons | - | For sauteing | | Garlic | 8 cloves | Minced | Fresh only | | Shallots | 4 medium | Thinly sliced | Or red onion | | Red bell pepper | 1 medium | Cut into strips | For color and sweetness | | Thai bird chilies | 6-8 chilies | Sliced | Adjust to heat preference | | Dried red chilies | 4-5 | Soaked and chopped | Adds depth | | Tamarind paste | 3 tablespoons | Dissolved in 1/4 cup water | Seedless concentrate | | Palm sugar | 1/4 cup | Grated or chopped | Essential for authentic flavor | | Fish sauce | 3 tablespoons | High-quality | Adjust to taste | | Water | 1/2 cup | - | For sauce consistency | | Cornstarch slurry | 1 tbsp starch + 2 tbsp water | Mixed | For thickening |

For Garnish

| Ingredient | Amount | Preparation | Notes | |------------|--------|-------------|-------| | Fresh Thai basil | 1 cup | Leaves only | Holy basil if available | | Kaffir lime leaves | 4-6 leaves | Very finely julienned | Removes center vein | | Fresh cilantro | 1/2 cup | Sprigs | For garnish | | Fried garlic | 2 tablespoons | Store-bought or homemade | Optional crunch | | Fresh red chilies | 2-3 | Sliced | For color |

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Equipment Needed

Large wok or deep frying pan (14-inch minimum) - Must accommodate whole fish

Deep fry/candy thermometer - Essential for maintaining 350-375 degrees F

Long-handled spider strainer - For safely handling fish in hot oil

Fish spatula - Wide, flexible blade for turning fish

Sharp knife - For scoring the fish

Paper towels - For draining

Wire rack - Set over sheet pan for draining

Large serving platter - For dramatic presentation

Splatter guard - Recommended for safety

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Step-by-Step Instructions

Phase 1: Prepare the Fish (15 minutes)

Step 1: Clean and dry the fish Ensure the fish is completely cleaned with scales removed. Rinse inside and out under cold water, then pat very dry with paper towels. Moisture is the enemy of crispy fish. Visual cue: The fish surface should feel dry to the touch, not slick or wet. Step 2: Score the fish Using a sharp knife, make 3-4 diagonal slashes on each side of the fish, cutting through the flesh to the bone. These cuts should be about 2 inches apart and penetrate about 1/2 inch deep. Why score? Scoring allows the marinade to penetrate, ensures even cooking, and creates beautiful crispy edges when fried. Step 3: Marinate the fish Rub the fish sauce and white pepper all over the fish, working it into the scored cuts and inside the cavity. Let the fish marinate for 10-15 minutes while you prepare other ingredients. Step 4: Prepare the coating In a shallow dish, mix together the rice flour and tapioca starch. This combination creates an extra-crispy coating that stays crunchy even under the sauce. Step 5: Coat the fish Dredge the marinated fish thoroughly in the flour mixture, pressing the coating into the scored cuts. Shake off excess flour and let the fish rest on a wire rack for 5 minutes before frying. Visual cue: The coating should be even and relatively thin - not thick and clumpy. Timing tip: The brief rest allows the coating to adhere better, preventing it from falling off during frying.

Phase 2: Prepare the Sauce Base (10 minutes)

Step 6: Soak the dried chilies Place dried chilies in hot water for 10 minutes until softened. Drain and roughly chop. Set aside. Step 7: Prepare tamarind water Dissolve tamarind paste in 1/4 cup warm water, stirring to create a smooth mixture. Strain if necessary to remove any seeds or fiber. Step 8: Prepare the vegetables Slice shallots into thin rings. Cut bell pepper into strips. Slice fresh chilies. Mince garlic. Julienne the kaffir lime leaves very finely. Mise en place: Have all sauce ingredients measured and ready - the sauce comes together quickly once you start cooking.

Phase 3: Deep Fry the Fish (15 minutes)

Step 9: Heat the oil Pour oil into your wok to a depth of at least 2-3 inches - enough to submerge most of the fish. Heat over medium-high heat until the temperature reaches 350 degrees F. Safety reminder: Never fill the wok more than halfway with oil. Have a lid nearby in case of flare-ups. Step 10: Test the oil Drop a small piece of flour coating into the oil. It should sizzle immediately and float to the surface within 2-3 seconds. If it sinks and sits, the oil isn't hot enough. Step 11: Fry the fish (first fry) Carefully lower the fish into the hot oil, sliding it away from you to prevent splashing. The fish should sizzle vigorously immediately. Technique tip: Hold the fish by the tail with tongs and lower head-first. Some cooks briefly hold the head submerged while the body floats to ensure even crisping. Step 12: Fry until golden Fry for 5-7 minutes on the first side, using a ladle to baste the exposed parts with hot oil. The fish should turn deep golden brown. Visual cue: The bubbling around the fish will slow significantly as it cooks. The surface should look dry and crispy. Step 13: Turn and complete Using two spatulas or a spider strainer, carefully turn the fish. Fry for another 5-6 minutes until the second side is equally golden and the fish is cooked through. Doneness test: The internal temperature should reach 145 degrees F. The flesh in the deepest score should be opaque and flake easily. Step 14: Drain the fish Carefully remove the fish and place on a wire rack set over a sheet pan. Let drain while you prepare the sauce. Critical: Work quickly on the sauce - the fish should be served hot while still crispy.

Phase 4: Make the Sweet Chili Sauce (8 minutes)

Step 15: Start the aromatics Carefully pour off all but 3 tablespoons of frying oil from the wok (or use a fresh pan with 3 tablespoons oil). Heat over high heat until shimmering. Step 16: Saute the aromatics Add minced garlic and sliced shallots. Stir-fry for 30 seconds until fragrant. Add the soaked dried chilies and fresh Thai chilies. Stir-fry for another 30 seconds. Visual cue: The garlic should be golden, not brown. The shallots should be softening at the edges. Step 17: Add bell pepper Add the bell pepper strips and stir-fry for 1 minute until slightly softened but still crisp. Step 18: Build the sauce Add the tamarind water, palm sugar, fish sauce, and water. Stir to dissolve the sugar. Bring to a boil, then reduce heat and simmer for 2-3 minutes. Step 19: Taste and adjust The sauce should be a perfect balance of sweet, sour, salty, and spicy. Adjust with more palm sugar (for sweetness), tamarind (for sourness), fish sauce (for salt), or chilies (for heat). Flavor profile: The sweetness should hit first, followed by sourness, with heat building at the finish. Step 20: Thicken the sauce Stir the cornstarch slurry to recombine, then add to the sauce. Stir constantly until the sauce thickens to a glossy consistency that coats a spoon. Visual cue: The sauce should be thick enough to cling to the vegetables but still pourable. Step 21: Add fresh herbs Remove from heat and stir in half of the Thai basil leaves. They will wilt slightly in the residual heat, releasing their aromatic oils.

Phase 5: Assemble and Serve (5 minutes)

Step 22: Position the fish Carefully transfer the crispy fish to a large serving platter, positioning it at a slight diagonal for visual appeal. Presentation tip: The head should traditionally point toward the guest of honor or the center of the table. Step 23: Pour the sauce Immediately ladle the hot sauce over and around the fish, making sure some pools alongside the fish and some cascades dramatically over the top. Step 24: Final garnish Scatter the remaining fresh Thai basil, julienned kaffir lime leaves, and cilantro sprigs over the top. Add sliced fresh chilies for color if desired. Step 25: Serve immediately Bring the platter to the table immediately while the fish is still crackling crispy. Serve with steamed jasmine rice and allow guests to pull pieces of fish with their serving spoons. Timing is critical: This dish waits for no one. The contrast between crispy fish and glossy sauce is the entire point - delays diminish the experience.

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Expert Tips for Perfect Pla Rad Prik

Selecting the Right Fish

Sea bass (Pla Krapong): The traditional choice with firm, sweet flesh that stays intact during frying

Red snapper: Excellent alternative with beautiful presentation

Tilapia: Budget-friendly option that fries well

Avoid: Delicate fish like sole or flounder that fall apart

Achieving Maximum Crispiness

The fish must be bone-dry before coating

Rice flour creates a crispier crust than all-purpose flour

Let the coated fish rest briefly before frying

Oil temperature is critical - too low means greasy, too high means burnt outside/raw inside

The double-fry method (fry, rest, fry again) creates extra crispiness for special occasions

Sauce Balance Principles

Thai cooking balances four main flavors. In Pla Rad Prik:

Sweet (palm sugar): Should be prominent but not cloying

Sour (tamarind): Provides brightness and cuts the richness

Salty (fish sauce): Enhances all other flavors

Spicy (chilies): Building heat that doesn't overwhelm

Common Mistakes to Avoid

Wet fish: Causes dangerous spattering and prevents crisping

Overcrowded wok: Drops oil temperature dramatically

Sauce too thick: Should pour, not plop

Late service: Crispy fish becomes soggy within minutes under sauce

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Variations and Adaptations

Fish Fillet Version

Use 4 fish fillets (6 oz each) instead of whole fish. Fry for 3-4 minutes per side. Arrange on platter and sauce the same way.

Spicier Southern Thai Style

Double the chilies and add 1 tablespoon of Thai roasted chili paste (nam prik pao) to the sauce for a smokier, hotter version popular in Southern Thailand.

Vegetarian/Vegan Adaptation

Substitute firm tofu or king oyster mushrooms for fish. Press tofu well, coat and fry until golden. Replace fish sauce with mushroom sauce or soy sauce.

Sweet and Sour Version (Less Spicy)

Reduce chilies to 2-3, increase bell pepper, and add pineapple chunks for a milder, family-friendly version.

Air Fryer Adaptation

Score and marinate fish as directed. Spray generously with oil. Air fry at 400 degrees F for 15-18 minutes, flipping halfway. The texture will be different but still delicious.

Three-Flavor Fish (Pla Sam Rot)

A related classic - add more garlic and eliminate the tamarind for a garlic-forward sweet-salty-spicy version.

Steamed Fish Base

For a lighter version, steam the fish instead of frying. Score, season, and steam for 12-15 minutes. Top with a thinner version of the sauce. Less dramatic but healthier.

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Serving Suggestions

Traditional Thai Presentation

Serve as the centerpiece of a Thai family meal

Pair with 2-3 other dishes: a curry, a stir-fry, and a soup

Provide plenty of jasmine rice for soaking up the sauce

Offer lime wedges for squeezing over individual portions

Restaurant-Style Service

Present the whole fish on an oval platter

Pour sauce tableside for dramatic effect

Fillet at the table for guests or allow self-service

Casual Family Dinner

Serve with steamed vegetables and rice

Pre-portion into individual servings for easier eating

Have extra sauce on the side for rice

Special Occasion Banquet

Position as the main protein course

Accompany with whole steamed crabs and prawn dishes

Serve after appetizers and soup

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Storage Instructions

Refrigerator Storage

Leftover fish: Store in an airtight container for up to 2 days. The crispy coating will soften.

Sauce: Store separately for up to 5 days. The sauce actually improves overnight as flavors meld.

Do not store assembled: The sauce will make the fish soggy

Reheating Instructions

Fish: Reheat in a 400 degrees F oven for 8-10 minutes to restore some crispiness

Air fryer: Reheat at 375 degrees F for 5-7 minutes

Sauce: Reheat in a small saucepan, adding a splash of water if too thick

Assemble fresh: Pour hot sauce over reheated fish just before serving

Do not microwave: Microwaving makes fish rubbery

Make-Ahead Options

Prepare and marinate fish up to 24 hours ahead (keep refrigerated)

Make sauce up to 3 days ahead (refrigerate, reheat before serving)

Prepare all vegetables and aromatics the day before

Fry fish just before serving - there's no good way to keep it crispy

Freezing

Raw marinated fish: Freeze for up to 2 months

Cooked fish: Not recommended - texture deteriorates significantly

Sauce: Freezes well for up to 3 months; thaw overnight in refrigerator

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Nutritional Information

| Nutrient | Per Serving | |----------|-------------| | Calories | 385 | | Total Fat | 18g | | Saturated Fat | 3g | | Cholesterol | 85mg | | Sodium | 980mg | | Total Carbohydrates | 22g | | Dietary Fiber | 2g | | Sugars | 14g | | Protein | 35g | | Omega-3 Fatty Acids | 1.2g | *Nutritional values are estimates based on standard ingredients and may vary.*

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Frequently Asked Questions

Why did my fish stick to the wok? The oil wasn't hot enough, or there was moisture on the fish. Ensure oil reaches 350 degrees F and fish is completely dry before frying. Can I use fish fillets instead of whole fish? Yes, though presentation is less dramatic. Fillets fry faster (3-4 minutes per side) and are easier to serve but miss the traditional spectacle. My sauce is too sweet/sour/salty. How do I fix it? Balance with the opposite flavor: too sweet? add more tamarind. Too sour? add more palm sugar. Too salty? add sugar and a splash of water. The coating fell off during frying. What went wrong? The fish was too wet, the coating was too thick, or you moved the fish too soon after adding to oil. Let it set for 2 minutes before moving. Can I shallow-fry instead of deep-fry? You can, but you'll need to turn the fish more carefully and the coating won't be as evenly crispy. Use at least 1 inch of oil. How do I know when the fish is fully cooked? The internal temperature should reach 145 degrees F. The flesh in the deepest score mark should be opaque white and flake easily with a fork.

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Equipment Recommendations

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:

Cod or halibut: Mild, flaky white fish that works in nearly any recipe. Cod is thinner, so adjust cooking time accordingly.

Shrimp (large): Peel and devein, then cook for significantly less time. Shrimp are done when they turn pink and curl into a C shape.

Salmon fillets: Richer and fattier than most white fish. Reduce any added oil and cook for 1-2 minutes longer per inch of thickness.

Firm tofu: Press for 30 minutes, then slice or cube. Season with kelp powder or Old Bay for a seafood-adjacent flavor profile.

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

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:

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.

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.

Cooking times change when scaling up. A doubled recipe in the same vessel needs 15-25% more time, not double. Monitor closely and use a thermometer.

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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Essential Equipment

Joyce Chen 14-Inch Carbon Steel Wok The classic wok for Thai cooking. Once seasoned, the carbon steel develops natural non-stick properties and can handle the high heat needed for crispy fish. Shop Joyce Chen Wok Taylor Precision Deep Fry Thermometer Accurate temperature monitoring is essential for safe, consistent frying. This model clips to your wok and withstands high heat. Shop Taylor Thermometer Spider Strainer with Wooden Handle Essential for safely lowering fish into hot oil and retrieving it. The long wooden handle stays cool and provides excellent control. Shop Spider Strainer Fish Spatula by Wusthof The flexible, slotted blade slides under delicate fish without breaking it. An indispensable tool for any serious fish cook. Shop Wusthof Fish Spatula

Recommended Ingredients

Three Crabs Fish Sauce Premium fish sauce with clean, balanced umami flavor. The industry standard for authentic Thai cooking. Shop Three Crabs Fish Sauce Tamicon Tamarind Concentrate Pure tamarind paste without additives. The essential sour component for authentic Pla Rad Prik. Shop Tamicon Tamarind Golden Mountain Thai Palm Sugar Authentic palm sugar with complex caramel notes that brown sugar cannot replicate. Shop Thai Palm Sugar

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*Recipe developed and tested in our kitchen. Last updated: 2026-01-19* *Have you made this Thai Braised Fish? Share your photos and experience in the comments below!*