Bring 750 ml water and a little salt to the boil. Add the rice mixture, bring to the boil briefly and allow to swell over a low to medium heat for about 35 minutes. The water must be completely absorbed.
In the meantime, clean, wash and quarter the savoy cabbage and cut out the stalk. Peel and finely chop the onion. Heat the fat in a saucepan. Fry the onion in it until transparent. Add the savoy cabbage, braise briefly and deglaze with stock.
Cover and stew for 10-15 minutes. Peel the garlic and press it into the sour cream using a garlic press. Add lemon zest, some salt and pepper and mix. Wash parsley, dab dry and chop finely, except for a little for garnishing.
Season the savoy cabbage with salt, pepper and nutmeg. Fold in the rice mixture and divide into 4 plates. Arrange salmon on top. Sprinkle with parsley and lemon wedges and garnish. Add sour cream sauce, sprinkled with coloured pepper to taste.