In a large heavy saucepan on a range burner, cook onion and garlic in butter until translucent, don't burn. Mash 1 cup of the beans with a fork and add, along with the remaining whole beans, to the onions. Md tomato sauce and salsa. Over a low heat stir in cheese, a handful at a time. Keep stirring until cheese is melted and mixture is hot. Transfer mixture to a fondue pot over low to medium heat. Serve with fondue forks and chunks of French bread and an assortment of other dunkables such as cocktail franks, strips of green pepper, celery, carrot sticks and chunks of apple and let everyone dip in. Yields: 5 super size or up to 10 snack size servings