BBQ sauce for Beef or Pork

This recipe is from my Grandma Billie. She makes this every year for our giant Lehi Round-Up celebration.

2 1/2 cups water
5 cups ketchup
3/4 cup vinegar
1/2 cup worchestershire sauce
3/4 cup brown sugar
3/4 cup butter, melted
3 tsp. mustard
2 onions, chopped
2 green peppers, chopped
3 celery stalks, chopped
2 cloves garlic, minced ( I use 1 tsp. of garlic powder)
2 T. chili powder
1 T. paprika

This is just the sauce that you put on the meat. It makes 2 quarts of sauce. When I make it I divide it up into 2 cup servings and freeze the extras. One of those servings is the perfect amount for a small roast or the leftovers from a sunday roast. If you make the full recipe you will use four 5 lb. roasts. Grandma uses beef and pork together, browned and cooked on low until meat falls apart.