Cook the rice in boiling salted water for about 25 minutes. Peel and finely dice onion. Heat the fat. Fry diced onion until transparent. Add spinach and steam covered for about 15 minutes.
Quarter the lemon and bring to the boil with 1/2 litre salt water, bay leaf and peppercorns. Wash the salmon and let it simmer for 8-10 minutes at low heat. Reduce cream by about a third at high heat.
Wash the herbs and chop finely, except for something to garnish. Season cream with horseradish, salt, nutmeg and herbs. Mix the egg yolks and 2 tablespoons of sauce and stir into the sauce. Do not boil after that.
Drain the salmon and remove the skin. Season to taste spinach. Serve with salmon, herb cream and rice. Garnish with herbs.