Wash the lemon, grate it dry and peel half of the peel in zests. Wash parsley, shake dry and remove the leaves from 4 stalks. Chop half of the zests, pistachios and parsley leaves into small pieces.
Cook the pasta in boiling salted water according to the instructions on the packet. Wash salmon, dab dry and cut into 4 pieces. Cut lemon in half and squeeze juice. Season salmon with 1-2 tablespoons lemon juice, salt and pepper and turn in flour.
Tap off excess flour. Heat oil in a pan. Fry the fish for about 5 minutes while turning. Melt 40 g butter in a small pot and add chopped ingredients. Drain the noodles. Melt 1 tbsp. butter in a pan or wide saucepan.
Add lemon juice. Add pasta and lemon zests and mix. Season noodles with salt and pepper. Arrange salmon with lemon butter and noodles and garnish with parsley leaves.