In a Dutch oven, brown beef over medium-high heat. Drain fat. Add peppers to browned meat and sauté for 3 minutes. Stir in tomato sauce, diced tomatoes with juices, bouillon cubes, brown sugar, salt, pepper and soy sauce. Reduce heat to low; cover and simmer for 30 to 45 minutes, watching closely so it does not stick. Stir in rice and heat through. Yields 10 servings.