Wash chicken legs and pat dry with kitchen paper. Orange hot wash. Finely grate the skin, squeeze the juice. Mix oil, 2 tablespoons orange juice, half of the orange peel, salt and pepper.
Brush the legs with it and place them on a baking tray rinsed with cold water. Bake in the preheated oven (electric: 200 °C/ gas: level 3) for about 40 minutes. In the meantime, clean, wash and slice the kohlrabis.
Cook in boiling broth for about 10 minutes. Add the frozen peas about 3 minutes before the end of the cooking time and cook them. Pour off the vegetables and collect the broth. Heat the fat in a saucepan. Dust with flour and sauté until golden brown.
Deglaze with stock and milk while stirring, bring to the boil and simmer for about 5 minutes. Wash tarragon, dab dry and chop finely, except for a little bit for garnishing. Stir tarragon and the remaining orange peel into the sauce.
Add the vegetables and heat them up. Season béchamel vegetables with salt and pepper. Arrange chicken legs and béchamel vegetables on a plate. Garnish with remaining tarragon. Boiled potatoes taste good with it.