Barbeque Shredded Beef - cooking recipe

Ingredients

1 cup chopped onion, or more to taste
1 (15 ounce) can tomato sauce
1/4 cup brown sugar
2 tablespoons vinegar
4 teaspoons chili powder
1 teaspoon soy sauce
1 teaspoon salt
1/2 teaspoon dry mustard
1 1/2 pounds boneless beef chuck roast

Preparation

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.