Church Supper Sloppy Joes

Ingredients

• 7 pounds lean ground beef (90% lean)
• 1-1/2 cups chopped onion
• 1-1/2 cups chopped celery
• 1/2 cup packed brown sugar
• 2 tablespoons prepared mustard
• 6 cups tomato sauce
• 1/2 cup white vinegar
• 2 to 3 teaspoons minced garlic
• Salt and pepper to taste
• 1-1/2 cups shredded sharp cheddar cheese
• Hamburger buns