Dressing

1/3 cup fresh lime juice
2 tablespoons fish sauce (such as nam pla or nuoc nam)
2 tablespoons (packed) light brown sugar
1/2 teaspoon Sriracha sauce

Chicken

1 1/2 pounds skinless, boneless chicken breasts, cut into 1-inch pieces
1/2 cup coarsely chopped shallots
2 tablespoons thinly sliced lemongrass
2 kaffir lime leaves, thinly sliced
1 small red Thai chile, thinly sliced
1 garlic clove, thinly sliced
2 teaspoons fish sauce (such as nam pla or nuoc nam)
1 teaspoon kosher salt
3 tablespoons peanut oil or canola oil, divided
8 small iceberg lettuce or hearts of romaine leaves
Cilantro tender leaves and stems

Ingredient info:
Kaffir lime leaves are sold frozen and sometimes fresh at Asian markets. If unavailable, use 1/2 tsp. grated lime zest for each leaf

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