This is the traditional Hot Pot recipe from the north of England and is best enjoyed on cold evenings when we want something to warm us up. On first glance it may look bland but trust me, its a comforting satisfying dish, simplicity is its charm. Do not be tempted to add anything to it whatsoever, not even a bay leaf! With the exception of perhaps chopped oysters, a traditional ingredient which is generally no longer used, this dish needs nothing more than the ingredients stated. The mushrooms and kidneys are optional as they're not to everyone's taste and regional variations of the recipe allow for this but I would recommend using 1 or the other, you could use 2 lamb chops chopped up in place of the kidneys if you wish. Do not forget to season between layers!