Onions peel and chop finely. Clean, wash, shake dry and chop finely about 3/4 in the universal chopper. Put 4 leaves aside, cut the remaining leaves into fine strips.
Prepare the pasta in boiling salted water according to the instructions on the packet. In the meantime melt the fat and fry the onions until transparent. Dust with flour, sweat and gradually add stock and cream.
Bring to the boil while stirring, add finely chopped wild garlic and season to taste with salt, pepper and sugar. Pour the pasta into a sieve, drain and add to the sauce. Arrange noodles and salmon slices on plates, sprinkle with remaining wild garlic leaves and strips.