Cut the rabbit parts a little smaller, wash and dab dry. Heat the lard in a roaster. Fry the rabbit parts on both sides. Season with salt and pepper.
Deglaze with 1/2 litre water and 3 tablespoons of lemon juice, bring to the boil briefly. Braise in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 45 minutes. In the meantime clean, wash and slice the mushrooms.
Fry in hot oil while turning for 5 minutes. Season with salt and pepper. Deglaze with 1/4 litre water. Clean and wash spring onions, cut into bite-sized pieces. Peel rosemary needles. Add all prepared ingredients to the rabbit pieces 10 minutes before the end of the cooking time.
Mix cornflour and remaining lemon juice. Put rabbit parts aside for a short time. Stir cornflour into the stock, bring to the boil. Stir egg yolk and cream until smooth and stir into the sauce. Do not let it boil anymore.
Season again, fold in the rabbit parts. Serve garnished with fresh herbs and lemon wedges. Roast potatoes taste good with it.