Beef With Green Pepper, Tomato And Onion - cooking recipe

Ingredients

2 medium size green peppers
2 medium size tomatoes
3/4 c. onion
3/4 lb. flank steak
1 Tbsp. oyster sauce (optional) *
1 1/2 tsp. dry sherry
1 1/2 tsp. sugar
1 1/2 tsp. soy sauce
salt and pepper to taste
2 Tbsp. soy bean oil
1 1/2 to 2 Tbsp. cornstarch mixed with 1/4 c. cold water

Preparation

*If you cannot find it, might find it in Oriental shop.