Rinse and defrost the prawns. Wash the potatoes thoroughly and cut them lengthwise into slices. Put them on a fat pan of the oven, sprinkle with 2 tablespoons of oil and season with sea salt and pepper.
Mix and bake in a preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for 20-25 minutes. Mix yoghurt and lemon juice. Peel garlic and chop finely. Wash the dill and chop finely, except for a little for garnishing.
Mix yoghurt with garlic and dill, season with salt, pepper and sugar. Clean and wash the spinach. Heat 1 tablespoon of oil in a pot. Add the spinach, 5 tablespoons of water and 1 pinch of salt, collapse the spinach.
Wash the fish, dab dry and cut into cubes. Rinse shrimps again and pat dry. Heat 2 tablespoons of oil in a coated pan. Fry the salmon for approx. 4 minutes, turning the prawns for 2 minutes.
Fold in the spinach. Arrange the potato wedges on plates with the salmon and prawns pan and a dash of yoghurt. Add the rest of the yoghurt.