Cook the onion and garlic in butter in a medium saucepan until tender. Add ketchup, water, vinegar, brown sugar, mustard, Salt
, pepper and hot pepper sauce. Bring to a boil. Remove from the heat and let stand for the flavors to mingle.
At this point, a sliced lemon or orange can be added, or a bit of the juice of either. With this recipe, true Texans usually add their own SECRET INGREDIENTS which can include beer, wine, bourbon, bay leaves, chili powder, tomatoes, vegetable oil or fat.