Saute each separately:

1 long sliced red sweet pepper
1 long sliced green pepper
1 med. onion
1 c. zucchini or mushrooms
1 lb. sirloin, cut in strips
1 sm. can sliced green beans (French style)

Put all together in skillet, add 1 teaspoon dry mustard, 1 tablespoon soy sauce and 2 tablespoons vinegar. Serve on bed of lettuce and sliced pineapple.