Grandpa's Classic Coney Sauce

Instructions

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1. 1 Gather the ingredients.
2. 2 Place ground beef and onion in a large skillet over medium-high heat. Cook, stirring to crumble, until beef is browned; drain.
3. 3 Transfer the beef and onion to a slow cooker and stir in ketchup, sugar, vinegar, and mustard. Season with Worcestershire, salt, celery seed, and pepper.
4. 4 Cover and simmer on Low for 3 hours before serving.