Mix egg and 1/8 l cold water in a bowl. Stir in the contents of the bag potato dough with a whisk and let it swell for about 5 minutes. Stir yoghurt, mayonnaise and lemon juice until smooth. Peel garlic, press through the garlic press and stir in. Season to taste with salt and pepper. Peel and chop the onion. Drain the mushrooms.
Fry both in hot fat for about 5 minutes, season with salt and pepper. Wash and chop the parsley and sprinkle over it. Form potato dough into a roll on a floured work surface. Cut into 9 slices and fry in hot oil for 2-3 minutes on each side. Serve with mushrooms and sauce. Serve garnished with salad, tomatoes and herbs
510 cal. / 2410 kJ