1/2 cup white vinegar
1/3 cup sugar
1/4 teaspoon red pepper flakes
1/2 cup chopped fresh cilantro leaves
2 tablespoons fish sauce (see note)
1 tablespoon grated fresh ginger
3 garlic cloves , minced
4 boneless, skinless chicken breasts (about 1 1/2 pounds)
1 tablespoon vegetable oil
Salt and pepper
Rub chicken with oil and season with salt and pepper.
Grill over hot fire until cooked through, about 5 minutes per side. Transfer to platter and brush with 1/4 cup sauce. Tent with foil and let rest 5 minutes. Serve, passing remaining sauce at table.