First cook the potatoes in a saucepan with a little salted water. To do this, the potato should be about a third covered with water.
Finely chop the dill, rub some lemon peel and squeeze out the lemon juice.
Mix the crabs with olive oil, 1 teaspoon lemon juice and dill, then season with salt and pepper to taste.
For the sour cream, mix crème fraîche and quark and mix with a little lemon zest, balsamic vinegar and salt and pepper.
Now take the cooked potato out of the saucepan and cut it lengthways. Possibly make a small hollow in the halves with a spoon. Spread some sour cream and the shrimps on top and garnish with dill.
For the cucumber salad, first wash and peel the cucumber thoroughly. Cut the cucumber into thin slices. Cut the onion into fine cubes. Process both together with about 100 ml vegetable stock, salt and balsamic vinegar into a dressing. Pour this over the cucumber and season with dill.