Wash the Kasseler, dab dry and rub pepper all around. Heat clarified butter in a casserole dish and fry the smoked pork loin on all sides. Let it braise at medium heat for 45-50 minutes.
Meanwhile lilac berries, sort, wash, drain well and remove the stalks. Crush the berries slightly in the pot. Cover and cook for about 10 minutes, pass through a sieve and collect the pulp.
Wash and quarter the apples and remove the cores. Finely dice the apples. Peel and finely grate the ginger. Add 2/3 of the apples, cinnamon stick, ginger, lemon peel, 150 g sugar and 3 tablespoons vinegar to the fruit pulp and let it boil down to a thick mass while stirring constantly.
Add the rest of the apples. Season with remaining sugar and a little vinegar. Boil again briefly. Remove the cinnamon stick and let the relish cool down and serve with the cured pork loin.