Chicken Fajita Stir-Fry

Combine chicken, cornstarch, 1½ tsp. soy sauce, and 1 tsp. cider (or sherry) in a medium bowl. Stir until the cornstarch is no longer visible. Add 1 tsp. oil and stir until the chicken is lightly coated.

Combine 2 Tbsp. broth, vinegar, and the remaining 1 Tbsp. soy sauce and 1 Tbsp. cider (or sherry) in a small bowl. Set aside.

Heat a 14-inch flat-bottomed carbon-steel wok (or a 12-inch stainless-steel skillet) over high heat until a drop of water vaporizes within 1 to 2 seconds of contact. Swirl in the remaining 1 Tbsp. oil. Add onion and garlic; stir-fry until fragrant, about 10 seconds. Push the onion mixture to the sides of the pan and add the chicken in an even layer. Cook, undisturbed, until the chicken begins to brown, about 1 minute. Sprinkle evenly with chili powder. Using a metal spatula, stir-fry the chicken until lightly browned but not cooked through, about 1 minute more. Transfer to a plate.

Add bell pepper and the remaining ¼ cup broth; cover and cook for 1 minute. Uncover and stir the pepper mixture, then return the chicken and any accumulated juices to the pan, along with the reserved broth mixture. Season with salt and stir-fry until the chicken is cooked through, 1 to 2 minutes. Stir in cilantro. Remove the garlic cloves, if desired.

To serve, spoon ⅓ cup chicken mixture into each lettuce leaf. Dollop each one with 1 tsp. yogurt and 2 tsp. diced mango (or peach or pineapple), and garnish with avocado and more cilantro, if desired. Serve with lime wedges.