Wash, clean and halve the mushrooms. Peel and finely chop the onion. Fry both in hot fat. Deglaze with 1/8 litre water and cream and bring to the boil. Stir in broth and thicken with sauce thickener.
Cook pasta in salted water for about 5 minutes and drain. Wash the dill, dab dry and cut finely. Cut salmon into strips. Add both to the sauce. Season with lemon juice and n-peel, salt and pepper. Stir in egg yolk and do not boil any more. Spread the pasta into 4 mussel shells or ovenproof trays. Pour sauce over them. Bake in a preheated oven (electric: 200 °C/ gas: level 3) for 15-20 minutes.
Season with lemon juice and n-peel, salt and pepper. Stir in egg yolk and do not boil any more. Spread the pasta into 4 mussel shells or ovenproof trays. Pour sauce over them. Bake in a preheated oven (electric: 200 °C/ gas: level 3) for 15-20 minutes. Garnish with lemon wedges