Teriyaki Beef and Vegetables

1 1/2 lbs. boneless beef sirloin steak, cut in thin strips
1 pkg. (8 oz.) mushrooms, sliced
1 medium zucchini, sliced
1 medium red bell pepper, diced
1 medium red onion, chopped
4 cloves garlic, finely chopped
1/2 c. Lawry's Teriyaki Marinade with Pineapple Juice
1 TBSP. flour
Hot cooked rice

Pre-heat over to 450.  Fold 2 pieces of foil together at seams to create a larger piece of foil.  Put seam in the middle of cookie sheet and leave edges of foil over edges of pan.  Arrange beef, mushrooms, zucchini, red pepper and onion in foil bag in an even layer; sprinkle with garlic.  Combine teriyaki marinade and flour; spoon over ingredients in foil bag.  Wrap foil over food and seal together on the top and ends.  Leave on cookie sheet and refrigerate p to 30 minutes, if desired.  To cook, place cookie sheet and foil wrapped food together on rack of pre-heated oven.  Cook for 20-25 minutes.  Use oven mitts to cut open foil with sharp knife or scissors.  Carefully fold back top of foil bag, allowing steam to escape.  Stir ingredients and serve with rice.