This recipe is a designer sandwich which I often make from left-overs or as a complete supper meal. The cooked ham I’m using here is from my Boiled Bacon recipe – there always seems to be some left over. Of course, you don’t have to cook bacon or ham just for this recipe; I’m sure you can buy some good cooked ham at the shops. Welsh rarebit, however, is a must for this dish. Plain melted cheese just isn’t the same.