Simmer the sauerkraut with water, bay leaf, juniper berries, cloves, peppercorns, onions and the bacon for about 2 hours. Then add the peeled, finely chopped apple without the core. Or some apple juice. Let simmer for another hour. If necessary, always top up with a little water or white wine. When the cabbage is soft, stir in the lard and add a little more seasoning if necessary. At the end add the grated potato and bring to the boil.