Peel onions, quarter 2 of them. Boil the onion quarters with spices in about 2 litres of water. Cook the smoked pork in it for about 45 minutes. Wash the asparagus and cut off the woody ends generously.
Wrap the asparagus in a damp cloth. Wash the herbs and, except for a little chervil for garnishing, cut finely. Dice the remaining onion very finely. Mix with crème fraîche, 6 tablespoons of milk and herbs.
Season to taste with salt and pepper. Put it in a cold place. Defrost the puff pastry. Remove the smoked pork loin, drain and let it cool down a little. Whisk the egg yolks and 1-2 tablespoons of milk. Roll out 2 pastry sheets on a little flour until slightly larger.
Cut out hares and flowers as desired. Place on a baking tray lined with baking paper. Spread with egg milk. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 10-15 minutes.
Take it out. Place the remaining dough sheets on top of each other and roll out to a square (approx. 30 x 30 cm) on a little flour. Rub Kasseler with coarse pepper and lay on the dough. Whip the dough over it and press it down firmly at the seams.
Spread with egg milk. Place on a baking tray lined with baking paper. Bake in the oven at the same temperature for 30-35 minutes. After about 25 minutes, sprinkle with cheese. Cover the asparagus and cook in salted water with sugar for about 8 minutes.
Cut open the cured pork. Do everything. Garnish with dough blossoms, rabbits and the rest of the chervil.