Ingredients:
4 slices of the best bacon you can find
2 slices bread
room temperature butter
ketchup or HP sauce, or both
Cook the bacon the way you like it. Then drain it on some paper towels. Butter 2 slices of bread. Fold over bacon slices on the buttered side of 1 slice of bread. Now cover it with HP sauce and ketchup.
Wait, what's HP sauce you say? HP Sauce has a malt vinegar base, blended with tomato, dates, tamarind extract, sweetener and spices. If you don't have it, there is no reason to go out and buy. Ketchup with do the trick. But hey, if you want to try it, Amazon sells it.
Now cover with other piece of bread, buttered side down and smush together. Slice in half and serve.
And if that doesn't fix your headache, have a bloody mary. Always does the trick for me.