1/2 cup chicken broth
1/2 cup soy sauce
1/2 cup rice vinegar
3 cloves garlic, crushed
2 pounds fresh boneless, skinless turkey breast cutlets
1 1/2 teaspoons granulated sugar
2 tablespoons water
2 teaspoons cornstarch
1/2 teaspoon salt
1/4 teaspoon ground black pepper
Combine broth, soy sauce, vinegar and garlic. Bring to a boil; remove from heat and cool to room temperature. Pour half the mixture over turkey breasts and marinate, refrigerated, for 30 minutes. To the remaining sauce, add sugar and reheat over medium heat. Add water mixed with cornstarch and cook until slightly thickened; set aside. Preheat grill.
Remove turkey from marinade. Season with salt and pepper. Place on lightly oiled grill and cook until browned on both sides and thoroughly cooked, about 10 minutes. Baste occasionally with thickened sauce. Serve warm.