Peel, wash and slice the kohlrabi. Steam for ten minutes in 1/4 litre of boiling water, covered with some salt and pepper. Wash the sausages, dab dry and cut diagonally.
Heat the oil in a pan. Fry the sausages on all sides at medium heat for ten minutes until crispy. Drain the kohlrabi and collect the vegetable water. Peel and chop the onions. Heat the fat in a saucepan.
Brown the onions in it. Dust with flour and curry and sauté while stirring until golden brown. Then deglaze with vegetable water, cream and milk while stirring. Add peas and boil up while stirring.
Season to taste with salt and pepper. Add the kohlrabi to the sauce and heat up again. Wash the chervil and chop it finely, except for one bunch (cut the chives into small rolls). Arrange the sausages on the vegetables.
Sprinkle with pepper and chervil. Garnish with the chervil bouquet.