Smoky Barbecue Sauce

This makes enough to serve 200 people.

5 to 6 medium onions, chopped
4 cups vegetable oil
5 bottles catsup
1 large and 1 small bottle Worcestershire sauce
3 cloves garlic, chopped
1 (16 ounce) box brown sugar
1 large and 1 small bottle Liquid Smoke

Saut