Slice onions put in a large bowl. Heat large skillet and melt stick of butter (do not burn), add onions to skillet raise heat to high and keep mixing until onions are carmalized (approximately a 1/2 hour to 45 minutes, again not burnt just carmalized). Add ketchup and hot sauce (2-4 tablespoons depending on how hot you like them), lower flame and simmer for about 10 minutes continuing to turn onions so all the onions get coated. Serve on hot dogs, sausage patties or anything you want. My husband was actually eating it by the spoon.