Wash the asparagus and cut the ends off generously. Cook for about 10 minutes in 1/4 l boiling salted water with a little sugar.
Wash the salmon, dab dry and cut into cubes. Sprinkle with 2 tablespoons lemon juice
Lift out the asparagus and keep the asparagus water. Heat the fat. Sweat flour in it until golden brown. Deglaze with asparagus water and milk while stirring. Let simmer for about 5 minutes. Season to taste with salt, pepper, mustard and the rest of the lemon juice. Whisk the egg yolks and add to the sauce (do not let it boil anymore!)
Salt the salmon lightly and put it in a greased dish with the asparagus. Pour sauce over it and bake in a hot oven (electric cooker: 200 °C / fan oven: 175 °C / gas: level 3) for 15-20 minutes. Garnish with lemon and dill. Serve with ribbon noodles
Drink: cool white wine