Tangy Horseradish Tomato Sauce For Meatballs

1 (10.75 ounce) can condensed tomato soup (such as Campbell s®)

1 (46 ounce) can tomato-vegetable juice cocktail (such as V8®)

3 tablespoons Worcestershire sauce, or to taste

¼ cup dried onion flakes

2 tablespoons dried parsley

2 tablespoons prepared horseradish

1 tablespoon extra-hot Dijon mustard

2 teaspoons garlic powder, or to taste

¼ teaspoon black pepper

3 tablespoons instant tapioca

2 cups water

Mix together the tomato soup, vegetable juice cocktail, Worcestershire sauce, onion flakes, dried parsley, horseradish, Dijon mustard, garlic powder, black pepper, tapioca, and water in a slow cooker. Set the cooker on Low, and cook until thickened, 3 to 4 hours.