Pepper Steak

3/4 to 1 inch thick

3 tablespoons vegetable oil

1 cup water

1 medium onion, cut into 1/4-inch slices

1 clove garlic, finely chopped

1/2 teaspoon finely chopped gingerroot or 1/4 teaspoon ground ginger

2 medium green bell peppers, cut into 3/4-inch strips

1 tablespoon cornstarch

2 teaspoons sugar, if desired

2 tablespoons soy sauce

2 medium tomatoes

6 cups hot cooked rice