Barbeque Shredded Beef

Ingredients (9)

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