1Cut steak in half and then crosswise into 1/8 inch thick strips. In large nonstick skillet, heat one tbs.of the oil over medium high heat. Add beef; cook and stir two to three minutes or until browned. Remove from skillet with slotted spoon; season with salt and pepper and set aside. In the same skillet, over medium high heat, heat remaining tbs. of oil. Add bell peppers, onion and garlic. Cook and stir two or three minutes or until tender. In a medium bowl, combine broth, water, cornstarch and soy sauce, and add to the skillet. Pour in the tomatoes. Cook, stirring constantly, until sauce boils and thickens. Return beef to skillet and cook until heated through. Serve over rice.