Dab meat dry and roast in the preheated oven (electric cooker: 200 °C/ gas: level 3) for approx. 20 minutes. Wash parsley, dab dry and chop. Mix honey, mustard and parsley.
Brush the roast with it and cook for another 25-35 minutes. Peel and finely dice the onion. Drain the pineapple and collect the juice. Cut pineapple rings into pieces. Fry onion in hot clarified butter.
Add the sauerkraut, pineapple and juniper berries. Pour in pineapple juice and 100 ml water. Let it braise for about 30 minutes. Season with salt. In the meantime boil up 1/4 litre water and salt for the duchess potatoes.
Remove the pot from the heat and add the milk. Stir in the purée flakes. Stir again after 1 minute. Pour the puree into a piping bag with a star-shaped spout and spray as tuffs onto a baking tray lined with baking paper.
Take the roast out of the oven and let it rest for about 15 minutes wrapped in aluminium foil. Bake the Duchess potatoes in the preheated oven (electric oven: 200 °C/ gas: level 3) for about 10 minutes until golden brown. Arrange roast with sauerkraut and potato crown on a plate.