Grandma's Spaghetti Sauce Recipe

Ingredients

• 3 pounds ground beef, or more to taste
• 1 large onion, chopped, or more to taste
• 2 (16 ounce) cans tomato sauce, or more to taste
• 2 (6 ounce) cans tomato paste
• ground black pepper to taste
• 1 (16 ounce) can tomato puree, or more to taste
• 0.5 cup ketchup
• 1 cup brown sugar
• 1 tablespoon prepared yellow mustard
• 1 tablespoon celery salt
• 1 tablespoon onion salt
• 1 tablespoon garlic salt
• 0.5 cup grated Parmesan cheese