Boil the eggs in boiling water for about 9 minutes, drain, rinse with cold water and peel. Halve the eggs as desired. Meanwhile peel and finely dice onion. Wash, clean and slice the mushrooms. Cut salmon into strips. Wash dill, dab dry and chop finely. Melt the fat in a pot.
Brown onions and mushrooms in it, dust with flour. While stirring, deglaze with stock and cream and bring to the boil. Stir in mustard and season to taste with salt, pepper and sugar. Add eggs and salmon to the sauce, heat up again briefly. Sprinkle with dill and serve garnished with lemon wheels and dill flags. Italian baguette tastes good with it