Sweet potatoes peel, wash and roughly dice. Cover and cook in salt water for 15-20 minutes
Peel the onions. Dice 1, cut 2 into rings. Roughly dice the smoked pork loin. Wash the thyme and pluck only a little. Wash apples, remove seeds and cut into slices. Sprinkle with lemon juice.
Heat 5 tablespoons of water, milk, 1/2 teaspoon of broth and 2 tablespoons of butter. Drain potatoes. Mash them finely with a potato masher and add the milk and fat mixture
Pour the puree into 4 small or 1 large greased casserole dish. Sprinkle with sugar. Heat the oil. Fry onion rings until golden brown. Spread the puree with 1 tablespoon butter in flakes, keep the frying fat. Bake the puree in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 10-15 minutes
Sauté the cured pork in hot frying fat. Fry onion cubes, apples and thyme briefly. Sprinkle with flour and sweat. Stir in 1/2 l water and 2 teaspoons broth, bring to the boil. Simmer for about 5 minutes. Season the Kasseler ragout to taste. Arrange everything, garnish with the rest of thyme