Cut pork into small cubes. In small bowl, combine soy sauce, mustard and meat cubes. Set aside. Half tomatoes and slice other veggies. Cook onions and carrots in 1/2 tablespoon oil. Set aside. Cook zucchini in 1/2 tablespoon oil for 30 seconds, then add mushrooms for 30 seconds. Remove and set aside. Stir-fry meat in 1/2 tablespoon oil for 2 to 3 minutes. Add veggies and tomatoes to meat. Serve over cooked noodles. Ramen noodles are good too.