Clean and peel the kohlrabis and cut into thin slices. Put kohlrabis in 1/8 litre boiling salted water and cover and cook for about 15 minutes. Wash salmon, dab dry and cut into 4 pieces. Knead flour and butter.
Pour cream into the kohlrabi and bring to the boil. Add flour dumpling while stirring, bring to the boil again. Season to taste with lemon juice and zest, salt and pepper. Keep vegetables warm.
Heat the oil in a pan. Season salmon with salt and pepper and fry on both sides for 1 minute each. Remove the leaves from the chervil. Arrange the kohlrabi with the salmon on plates, sprinkle chervil on top. Wild rice mixture tastes good with it