Peel and wash the potatoes, boil them in salted water and cook for about 25 minutes at medium heat. Drain the potatoes and immediately press them through a potato press into a wide mixing bowl. Let cool down for about 2 1/2 hours. In the meantime clean and wash the spinach and drain well. Peel onions and garlic and chop finely. Heat olive oil in a large pot, fry 2/3 of the onions and garlic in it while turning. Add the spinach, cover and let it collapse.
Season to taste with salt, pepper and nutmeg, drain well in a sieve. Meanwhile, wash the fish, dab dry and dice. Sprinkle with 2 tablespoons of lemon juice. Put them on four skewers. Squeeze the spinach well, chop coarsely. Knead the potatoes, 3 egg yolks, 150 g flour, salt and nutmeg with the dough hooks of the hand mixer, then knead briefly with your hands (it sticks a bit). Roll out to a rectangle (30x35 cm) on a well floured work surface. Spread the spinach evenly over it. Roll up from the long side and cut into 12 slices with a sharp knife. Heat the fat in a pot and fry the rest of the onion in it until transparent. Dust with 25 g flour, sauté, deglaze with stock and cream while stirring constantly, bring to the boil. Season to taste with salt, pepper, sugar and 2-3 tablespoons lemon juice. Remove from the heat, whisk 1 egg yolk and stir into the hot sauce. Keep warm.
Roll up from the long side and cut into 12 slices with a sharp knife. Heat the fat in a pot and fry the rest of the onion in it until transparent. Dust with 25 g flour, sauté, deglaze with stock and cream while stirring constantly, bring to the boil. Season to taste with salt, pepper, sugar and 2-3 tablespoons lemon juice. Remove from the heat, whisk 1 egg yolk and stir into the hot sauce. Keep warm. Heat 1 tablespoon of oil in a large coated frying pan, fry 6 potato slices in it on each side for about 2 minutes at medium heat. Keep warm. Heat 1 tablespoon of oil and fry the remaining potato slices in the same way. Heat 2 tablespoons of oil in a frying pan, add fish skewers and fry for approx. 1 minute on each side (4 minutes in total). Season with salt and pepper. Arrange skewers, potato slices and some sauce on a plate. Garnish with lemon slices and dill flags. Add the rest of the sauce extra
Keep warm. Heat 1 tablespoon of oil and fry the remaining potato slices in the same way. Heat 2 tablespoons of oil in a frying pan, add fish skewers and fry for approx. 1 minute on each side (4 minutes in total). Season with salt and pepper. Arrange skewers, potato slices and some sauce on a plate. Garnish with lemon slices and dill flags. Add the rest of the sauce extra
waiting time approx. 2 1/2 hours