Isan-Style Gai Yang with Lemongrass Marinade

Why You’ll Love This Recipe

• Classic Isan-style flavors: lemongrass, garlic, fish sauce, and a smoky grill finish.
• Juicy every time thanks to a marinade that seasons under the skin and a two-zone grill method.
• Balanced heat and tang from the toasty, tamarind-lime jaew dipping sauce.
• Perfect for backyard cooking, but simple oven directions are included.

Grocery List

• Produce: Lemongrass (3 stalks), garlic (1 head), cilantro (with roots if available), limes, shallot, scallion, fresh herbs (cilantro, Thai basil, mint), cucumber
• Dairy: None
• Pantry: Whole chicken (3.5–4 lb), fish sauce, light soy sauce, neutral oil, palm or light brown sugar, ground white pepper, ground coriander, ground turmeric, tamarind concentrate, Thai chili flakes, toasted rice powder, sticky (glutinous) rice, kosher salt, black pepper

Full Ingredients

For the Chicken

• 1 whole chicken (3.5–4 lb), spatchcocked (or 8 bone-in, skin-on thighs)
• 1 tsp kosher salt (for seasoning just before grilling, optional)

Lemongrass–Garlic Marinade

• 3 lemongrass stalks, tough outer layers removed; tender parts roughly chopped (about 1 cup)
• 8 garlic cloves
• 6 cilantro roots (or 1/2 cup packed cilantro stems), roughly chopped
• 1/4 cup fish sauce
• 2 tbsp light soy sauce
• 2 tbsp neutral oil (canola or rice bran)
• 2 tbsp palm sugar or light brown sugar, packed
• 1 tsp ground white pepper
• 1 tsp ground coriander
• 1/2 tsp ground turmeric (optional, for color and warmth)

Jaew Dipping Sauce

• 2 tbsp tamarind concentrate (or 2 tbsp tamarind paste mixed with 1–2 tbsp warm water)
• 2 tbsp fish sauce
• 2 tbsp fresh lime juice
• 1.5 tbsp palm sugar or light brown sugar
• 1 tbsp toasted rice powder (khao khua), plus more for sprinkling
• 1–2 tsp Thai chili flakes (to taste)
• 1 small shallot, very thinly sliced
• 1 scallion, thinly sliced
• 2 tbsp chopped cilantro
• 1–2 tbsp warm water, as needed to loosen

To Serve

• 2 cups uncooked Thai sticky (glutinous) rice
• Cilantro, Thai basil, and mint sprigs
• 1 cucumber, sliced
• Lime wedges

Step-by-Step Instructions

Step 1: Spatchcock and season the chicken

Place the chicken breast-side down. Using kitchen shears, cut along both sides of the backbone and remove it. Flip the chicken, press firmly on the breastbone to flatten, and pat very dry. For thighs-only, simply pat dry. Loosen the skin over breasts and thighs with your fingers to make space for the marinade.

Step 2: Make the lemongrass–garlic marinade

In a mortar and pestle or food processor, grind/blend lemongrass, garlic, and cilantro roots/stems to a rough paste. Add fish sauce, light soy, neutral oil, palm sugar, white pepper, ground coriander, and turmeric; process until cohesive. Measure out 2 tablespoons of the paste into a clean bowl and refrigerate for basting later (this portion should never touch raw chicken).

Step 3: Marinate deeply

Rub the remaining marinade under the loosened skin and over all surfaces of the chicken. Place on a tray or in a zipper bag and refrigerate for 12 hours for best flavor (minimum 4 hours; up to 24 hours). If marinating more than 12 hours, cover loosely to avoid excessive salting.

Step 4: Make jaew dipping sauce

Stir together tamarind concentrate, fish sauce, lime juice, and palm sugar until the sugar dissolves. Add toasted rice powder, Thai chili flakes, shallot, scallion, and cilantro. Adjust with 1–2 tablespoons warm water for a spoonable consistency. Let stand 10 minutes to bloom flavors.

Step 5: Prepare the grill (or oven)

Preheat a grill to 400–450°F with two zones: one indirect (no flames beneath) and one direct. Clean and oil the grates. For the oven, preheat to 425°F with a rack set over a rimmed sheet; you will finish under the broiler to char.

Step 6: Grill low and slow, then char

Place chicken skin-side up over indirect heat, close the lid, and cook 30–35 minutes. Rotate the bird 180 degrees halfway for even browning. Brush lightly with the reserved clean marinade during the final 10 minutes. When the breast reaches 150°F and the thigh reaches 170°F, move the chicken skin-side down over direct heat for 5–8 minutes to crisp and char. Final temps: 165°F in the thickest part of the breast and 175–180°F in the thighs. If using the oven, roast 35–45 minutes to the same temps, then broil 2–4 minutes for char, watching closely.

Step 7: Rest, carve, and steam sticky rice

Transfer to a board and rest 10 minutes. Carve into leg quarters, wings, and breast pieces; or chop Thai-style through the bone into serving chunks. For sticky rice: soak 2 cups glutinous rice in cool water for 4–6 hours (or overnight), drain, then steam in a bamboo basket or lined steamer over simmering water for 15–20 minutes, turning once halfway. Keep warm, covered.

Step 8: Plate and serve

Arrange chicken on a platter. Sprinkle with a little toasted rice powder and chopped cilantro. Serve with warm sticky rice, cucumber slices, fresh herb sprigs, lime wedges, and a bowl of jaew for dipping.

Pro Tips

• Pounding the aromatics in a mortar draws out essential oils and a more vivid flavor than blending alone.
• Getting marinade under the skin is key to juicy, seasoned meat without overly salty skin.
• Two-zone grilling prevents burning sugars; finish over direct heat only at the end for blistered, smoky skin.
• Always reserve a clean portion of marinade before touching raw chicken; never baste with marinade that contacted raw poultry.
• Thermometer = success. Pull at 165°F breast and 175–180°F thigh for succulent results.

Variations

• All-thighs version: Use 8 bone-in, skin-on thighs. Grill indirect 20–25 minutes, then direct 4–6 minutes. Target 175–180°F.
• Coconut-kissed: Add 1/4 cup unsweetened coconut milk to the marinade for a richer, slightly creamier profile.
• Weeknight oven-only: Roast spatchcocked chicken at 425°F for 40–50 minutes, then broil briefly to char.

Storage & Make-Ahead

Marinate the chicken up to 24 hours in advance. The marinated raw chicken can be frozen up to 2 months; thaw in the refrigerator overnight. Cooked chicken keeps 3–4 days refrigerated; reheat covered at 325°F until warm, then broil briefly to re-crisp skin. Jaew keeps 3 days in the fridge (stir and add a squeeze of lime to brighten). Sticky rice is best the day it’s made; re-steam 3–5 minutes to refresh.

Nutrition (per serving)

Approximate for 1/4 chicken with skin and 2 tablespoons jaew (not including sticky rice): 520 calories; 31 g protein; 31 g fat; 13 g carbohydrates; 1,420 mg sodium.