Wash the cucumber thoroughly, rub dry and slice into wafer-thin slices. Mix with some salt and sugar and let it stand for a while. Peel onion, dice finely and add. Add vinegar and 2 tablespoons of oil. Season with pepper and cover and allow to stand for a while. Peel potatoes and cook in boiling salted water for about 20 minutes.
Meanwhile wash salmon and cod and pat dry. Remove bones with tweezers. Dice the fish finely and put them in a bowl. Add egg white, breadcrumbs, 2 tablespoons lemon juice and capers. Season with salt and lemon pepper and mix well. With moistened hands, form 8 longish meatballs from the farce. Heat the remaining oil in a coated pan. Fry the fish meatballs all around for about 8 minutes. Heat the cream in a casserole. Thicken slightly with sauce thickener. Wash the dill, dab dry and, except for something to garnish, cut finely and add to the sauce.
With moistened hands, form 8 longish meatballs from the farce. Heat the remaining oil in a coated pan. Fry the fish meatballs all around for about 8 minutes. Heat the cream in a casserole. Thicken slightly with sauce thickener. Wash the dill, dab dry and, except for something to garnish, cut finely and add to the sauce. Heat again and season with salt, pepper and remaining lemon juice. Wash lemon hot and rub dry. Cut into thin slices. Put the meatballs and lemon slices on skewers. Arrange everything and serve garnished with rest of dill
Heat again and season with salt, pepper and remaining lemon juice. Wash lemon hot and rub dry. Cut into thin slices. Put the meatballs and lemon slices on skewers. Arrange everything and serve garnished with rest of dill