Peel, wash and cut the kohlrabi into very thin slices. Peel and wash the potatoes and cut them into very thin slices. Layer potatoes and kohlrabi in 4 small or 1 large greased gratin dish. Season with salt and pepper from time to time. Pour cream over them and sprinkle with parmesan. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 40-45 minutes
In the meantime peel the carrots, leaving some green. Wash the rocket, shake dry and chop finely. Wash parsley, shake dry and chop finely, except for a few leaves for garnishing. Wash the lemon thoroughly, grate dry and finely grate the peel. Put olive oil, rocket, parsley and lemon zest in a tall mixing bowl. Season with salt and pepper. Briefly puree with a hand blender
Wash the meat, dab dry. Wrap 2 slices of bacon around each fillet, wrapping 2-3 parsley leaves in each. Heat oil in a pan. Fry the meat for about 15 minutes, turning it over.
Put carrots in boiling salted water with a pinch of sugar and cook for 12-15 minutes. Then carefully lift them out. Cut the meat into thick slices. Arrange meat with rocket oil, carrots and gratin on plates. Garnish with parsley