Melt the butter in a saucepan for the mash, add the mash and cream and mix thoroughly, serve a big spoonful with the sausages and onions and gravy. Stand back and marvel at what you have just created.
Place the "sausages" on the serving platter and sprinkle the diced tomatoes and Vidalia onion slices over them. Squeeze the lemon halves over the entire dish. Serve yogurt sauce on the side for guests ...