Break up ground chuck put in large fry pan. Add chopped onion, salt and pepper and Worcestershire sauce. Brown meat while breaking it apart.
When meat in browned add catchup and 1/4 cup water stir in. Turn heat to simmer and cook for about 15 minutes. Adjust the seasonings to taste then sprinkle flour over meat mixture and stir in to thicken and absorb liquid. Simmer 5 more minutes string frequently. Serve on Buns. Great with pickles and chips.