Barbeque Shredded Beef

Details

Ingredients

• 1 cup chopped onion, or more to taste
• 1 (15 ounce) can tomato sauce
• ¼ cup brown sugar
• 2 tablespoons vinegar
• 4 teaspoons chili powder
• 1 teaspoon soy sauce
• 1 teaspoon salt
• ½ teaspoon dry mustard
• 1 ½ pounds boneless beef chuck roast