Trim fat from steak; cut diagonally across grain into thin slices. Heat 1/2 teaspoon oil in a large nonstick skillet over medium-high heat. Add steak and onions; stir- fry 1 minute. Remove steak mixture from pan; keep warm. Heat 1/2 teaspoon oil until hot. Add cabbage; stir-fry 30 seconds. Remove cabbage from pan and keep warm. Remove noodles from packages; reserve one seasoning packet for another use. Add the water and remaining seasoning packet to pan. Bring to a boil. Break noodles in half and add to water mixture. Cook noodles 2 minutes, or until most of the liquid is absorbed, stirring frequently. Stir in steak mixture, cabbage and soy sauce. Cook until thoroughly heated.