Combine the beef stock, ketchup, onion, bacon drippings, 1/4 teaspoon salt and 1/2 to 1 teaspoon pepper in a medium pot. Bring to a boil, then reduce the heat to medium low and simmer until the onion is tender, about 10 minutes. Remove from the heat and set aside to let the flavors develop, at least 1 hour. Reheat the sauce before serving.
Photograph by Andrew Purcell
Recipe courtesy Food Network Magazine