Lemon slices Skin chicken with sharp knife; cut in thin 2-inch long slices. Sprinkle with salt. Mix cornstarch with 3 tbsp. water and soy sauce. Combine with beef broth and water. Bring to boil; stir often; add chicken, mushrooms and liquid, vinegar and sugar. Heat. Simmer 5 minutes. Serve with a slice of lemon in each bowl, a cruet of vinegar on the table. Makes 4 to 6 servings.