Brown ground beef, onion and pepper. Season with garlic salt and pepper. Add tomatoes and tomato sauce. Simmer 10 minutes while macaroni is cooking. Boil macaroni al dente, drain, rinse. Return macaroni to pot, add beef and tomato mixture. Serve in bowls with shredded cheese. Even better left over and reheated (add a little water or tomato juice when reheating, if too dry).