Combine soy sauce, garlic and grated lime peel in small bowl; add beef slices and mix well. In a non-stick skillet, heat oil then stir-fry green beans until crisp tender; season with 1/2 teaspoon salt. Remove from skillet. Stir-fry beef in same skillet to desired degree of doneness. Return beans to pan; add red pepper flakes and grapes and stir-fry until grapes are just barely heated. Add radishes, lime juice, remaining salt and sesame oil. Cool to room temperature for immediate service or refrigerate until served. When ready to serve, mix well and sprinkle with sesame seeds. Serve on bed of sliced lettuce or cabbage.