For the sauce, rinse the anchovy, dab dry and chop finely. Wash the dill, shake dry and chop. Peel horseradish and grate finely. Puree everything with 100 g butter, lemon peel and lemon juice in a mixing bowl with a hand blender until smooth.
Season strongly with salt, pepper and sugar and chill for about 1 hour.
Grate parmesan. Clean, wash and quarter the pointed cabbage and cut it into fine strips from the stalk. Peel and finely chop the onion. Heat 1 tablespoon of oil in a saucepan. Fry the onion in it. Sauté the rice briefly.
Pour on the wine, bring to the boil and simmer until it is almost overcooked. 1⁄2 Bring l water to the boil, dissolve the stock in it. Gradually pour into the rice. Add the next portion only after the rice has absorbed the stock.
Cook for a total of about 25 minutes. Mix in cabbage 10 minutes before the end of the cooking time, add to cooking.
Rinse fish, dab dry, cut into slices. Season with salt and turn in flour. Heat 2 tablespoons of oil in a frying pan. Fry the fillets for about 3 minutes on each side.
Whip cream until stiff, remove 2 tablespoons. Bring the rest to the boil in a small pot (becomes liquid again). Turn off the stove and gradually beat the cold horseradish butter in pieces with a whisk.
Remove from the heat, fold in the rest of the cream. Stir 1 tablespoon butter and cheese into the risotto, season to taste. Serve everything.