Peel and wash the potatoes, cut them into cubes of about 2 cm. Peel onion, cut into fine slices. Wash salmon and cut into cubes. Peel cucumber, cut in half lengthwise, remove seeds. Cut cucumber meat into pieces.
Wash herbs. Put some dill flags aside for garnishing. Chop remaining herbs. Cook potatoes in salt water for about 15 minutes. Meanwhile melt 1 tablespoon butter. Steam cucumber pieces in it at medium heat for about 5 minutes. Season with salt, pepper and pink berries. Deglaze with 200 ml water and simmer for about 3 minutes. Add cream, bring to the boil briefly, stir in mustard and herbs and thicken with sauce thickener. At the same time melt 1 tablespoon butter in another pan.
Season with salt, pepper and pink berries. Deglaze with 200 ml water and simmer for about 3 minutes. Add cream, bring to the boil briefly, stir in mustard and herbs and thicken with sauce thickener. At the same time melt 1 tablespoon butter in another pan. Fry onion and salmon for about 5 minutes while turning. Season with salt, pepper and lemon juice and add to the cucumber pan. Season again and serve with the potatoes