Wash parsley, shake dry, chop coarsely. Bark the toast and dice. Puree parsley, toast, nuts and 1 tablespoon of oil. Season with salt and pepper. Wash medallions and dab dry.
Cut a deep pocket in each and fill it with the nut mixture. Fry in 1-2 tablespoons of hot oil for 2 minutes on each side. Season with salt and pepper and place on a baking tray. Cook in the preheated oven (electric cooker: 80 °C) for about 1 1/2 hours until done.
Meanwhile, for the vegetables, peel the potatoes and kohlrabi, wash them and cut them into fine slices. Peel and finely chop the onion. Melt butter, fry onion and potatoes for about 5 minutes at low heat, salt a little.
Add the kohlrabi and sauté briefly. Deglaze with 200 ml water and cream, season with salt and pepper. Cover and cook for 8-10 minutes. Wash basil, pluck leaves, cut into strips and add to vegetables.
Serve with the medallions.