Superb Baked Beans

5 pounds ground beef
8 medium onions, chopped
2 sticks margarine
12 (15 ounce) cans Ranch style beans
8 (16 ounce) cans pork and beans
1 cup prepared mustard
2 cups brown sugar (packed)
1 cup maple syrup
4 cups catsup

Brown beef and onions in margarine and combine with remaining ingredients. Refrigerate overnight. Bake at 300 degrees for 1 1/2 to 2 hours.

Serves 50.