I have just started one today to see how it goes. It is basically a meat and veg stew to which other ingredients are added daily as portions are taken out to eat. It has to be brought to the boil for at least five minutes every day to kill any bacteria, but apart from that it needs nothing else but seasoning.
When I was very young we had a York range in the living room. It used coal or wood as fuel and had a hot-box (oven) with griddle (hot-plate), and a grill to the side. On the grill sat a huge double-handled pan into which any leftovers were placed after every meal. The pan was often topped up with water and regularly sieved to remove solid bits. The 'juice' was used as the base for broths and stocks for pies and other stews/casseroles.
I just wondered if it would work in the modern world.