Spinach clean, wash. Wash lemon, rub dry. Cut off 4 slices to garnish. Peel off the rest of the peel in fine strips, squeeze out the juice
Wash the salmon, pat dry and cut into 4 pieces. Sprinkle with 1-2 tbsp. lemon juice. Heat 1 tablespoon of oil in a frying pan. Fry the salmon for 3-4 minutes on each side. Season with salt and pepper, keep warm
Peel and finely dice the onions. Heat 1 tablespoon of oil in a pot. Fry half of the onions in it. Add dripping wet spinach and let it collapse. Season with salt, pepper and nutmeg
Heat 1 tablespoon of oil. Brown the rest of the onions in it. Deglaze with 100 ml water, add broth. Stir yoghurt and starch until smooth. Stir into the stock and bring to the boil while stirring briefly (!). Season to taste with 1-2 tbsp lemon juice, salt, pepper and sugar. Stir in lemon zest. Arrange everything, garnish with lemon. Served with: boiled potatoes