Mix milk, eggs, flour and 1 pinch of salt with a whisk to a smooth dough. Wash and peel the asparagus and cut off the woody ends. Boil up plenty of water, salt, sugar and 1 tablespoon of butter in a large pot.
Add the asparagus to the boiling water and cook covered for about 15 minutes. For the sauce, pour cream and 125 ml water into a pot. Stir in sauce powder with a whisk. Bring to the boil briefly while stirring, turn off the heat.
Beat 75 g butter in pieces until the butter has melted. Remove from the heat immediately. Drain the asparagus, rinse with cold water and drain. Heat some clarified butter in a small coated pan (approx. 20 cm Ø).
Add 1/8 of the dough and bake on each side for 1-2 minutes on a medium heat until golden brown. Remove and process the remaining dough in the same way. Wash the chervil, dab dry and put aside some for garnishing.
Finely chop the rest and stir into the sauce. Dice the smoked ham. Wrap 3 asparagus spears in one crepe each. Put them into a flat casserole dish. Pour chervil-hollandaise sauce over it and sprinkle with the ham.
Cook in the preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for 5-10 minutes. Garnish with chervil and serve immediately.