Ingredients

  • chopped onion, or more to taste
  • Can tomato sauce
  • Brown sugar
  • Vinegar
  • Chili powder
  • Soy sauce
  • Salt
  • Dry mustard
  • Boneless beef chuck roast

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Method

  • Stir onion, tomato sauce, brown sugar, vinegar, chili powder, soy sauce, salt, and mustard together in a slow cooker;
  • Add roast. Spoon onion mixture over the beef to coat.
  • Cook on High for 7 hours.
  • Shred meat in slow cooker with a pair of forks. Continue cooking 1 hour more.