Round steak, thinly sliced against grain
1 med. onion, chopped
1 can mushrooms (fresh mushrooms may be sauteed with onions)
1/2 c. bottled Teriyaki marinade

Heat 2 tablespoons butter in skillet. Add chopped onion and brown lightly. Add steak slices, brown gently. Add mushrooms and marinade. Mix 2 tablespoons water to 1 1/2 tablespoons cornstarch. Bring meat mixture quickly to a boil and stir in cornstarch. Serve with rice, noodles or potatoes.