Place ground beef in a large skillet over medium heat. Cook until evenly browned, stirring to crumble. I like to use a potato masher to even out the lumps. Add onion and celery, cover the pan, and cook until tender and transparent, about 5 minutes. Drain off any grease.
Stir the tomato soup (undiluted), ketchup, vinegar, brown sugar and Worcestershire sauce into the beef mixture. Season with salt and garlic powder. Heat to a simmer over low heat, and cook until thoroughly heated, stirring frequently to prevent it from burning on the bottom.
To Freeze: Freeze in freezer safe container
To Reheat: Reheat in pan or microwave. Serve on buns.