Clean, wash and finely dice the spring onions. Wash parsley and dill, pluck off leaves or flags and chop finely. Mix quark, 1 tbsp. oil, 1 tbsp. lemon juice and half of the spring onions, dill and parsley.
Season to taste with salt, pepper and sugar. Put the herb curd cheese in a cool place. Dice salmon finely. Clean, wash and finely dice the peppers. Mix salmon, paprika, remaining spring onions, 1 tbsp. oil and 2 tbsp. lemon juice.
Season to taste with salt and pepper. Peel, wash and roughly grate the potatoes. Grate the potatoes over a bowl. Carefully drain the potato water. Mix remaining potato starch, squeezed potatoes and eggs.
Season with salt, pepper and nutmeg. Heat 1 tablespoon of oil in a large, coated frying pan. Form 4 Rösti from half of the potato mixture and fry over low heat for 6-8 minutes. Turn the Rösti halfway through the frying time.
Keep finished Rösti warm. Fry the remaining 4 Rösti with 1 tbsp. oil in the same way. Clean and wash the rocket. Place 1 Rösti on each of 4 plates. Cover with some rocket. Add salmon tartare and herb quark. Put 1 Rösti on each plate.
Possibly garnish with dill flags.