Cook the pasta in plenty of boiling salted water for about 10 minutes
Peel and finely chop the onion. Cut salmon into fine strips. Heat the fat in a pot. Fry onion until transparent. Add flour, stir-fry until golden brown and deglaze with 3/8 l water and cream. Bring to the boil, stir in stock and simmer for about 5 minutes. Season to taste with salt, pepper and lemon juice. Fold in salmon strips
Drain the pasta, place it in a greased casserole dish or turn the spaghetti into nests. Pour sauce into the noodles or nests. Sprinkle with cheese. Bake at high heat in the oven or under the grill for 5-8 minutes
Drink: cool white wine