Ingredients

• 1 lb boneless skinless chicken thighs, trimmed of visible fat and cut into 1-1/2-inch pieces
• 1/2 cup granulated sugar
• 1 small red onion, halved and sliced
• 1 small seedless cucumber, peeled halved lengthwise and thinly sliced crosswise
• 3 small shallots, finely chopped
• 1 stalk fresh lemongrass, tender white inner bulb only, minced
• 3 tablespoons asian fish sauce
• 3 tablespoons chopped cilantro, plus
• 1 head boston lettuce or 1 head red leaf lettuce, leaves separated
• 3 garlic cloves, minced
• 1 tablespoon finely chopped mint, plus
• 1 1/2 teaspoons cornstarch
• Asian chili sauce, for serving
• 1/2 teaspoon kosher salt
• 1/2 teaspoon fresh ground pepper