Drain the artichokes and quarter them. Sort the spinach, wash and drain. Peel onion and garlic and dice finely.
Heat 1 tablespoon of oil in a saucepan. Sauté onion and garlic in it. Add the artichokes and spinach and steam briefly until the spinach collapses. Season with salt and pepper. 3⁄4 Add l water and stock.
Bring to the boil and simmer covered for about 5 minutes.
Wash the mint, shake dry and pluck off the leaves. Add mint to the soup and puree everything finely. Add half of the lemon peel to the soup. Mix sour cream and starch, also stir into the soup and bring to the boil again briefly.
Season to taste with about 1 tablespoon lemon juice.
Cut the fish fillet into bite-sized cubes. Sprinkle with about 1 tbsp. lemon juice and sprinkle with salt. Mix sesame and flour and turn the fish in it. Heat 1 tablespoon of oil in a large coated pan and fry the fish in it until golden brown all around.
Serve soup with fish and remaining lemon peel.