Wash the meat and pat dry. Rub with salt, pepper and 1 tablespoon of oil. Cover with bacon. Roast in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for about 1 hour. Gradually add approx. 1/4-3/8 l water
Peel, wash and slice the potatoes. Fry in 2 tablespoons of hot oil for 20-30 minutes, turning until golden brown. Season with salt and pepper
Peel and wash the vegetables. Cut carrots in half lengthwise if necessary and cut into diagonal pieces. Halve kohlrabi and cut into thin slices. Heat the fat and fry the vegetables in it. Add 3-4 tablespoons of water, cover and steam for about 10 minutes. Season with salt and pepper
Wash the chervil, remove the leaves and add half of it to the vegetables. Arrange meat and vegetables. Garnish with the rest chervil and lemon. Season to taste the roast stock. Potatoes and stock extra rich