For the crêpes, mix milk, eggs, flour and 1 pinch of salt with a whisk to a smooth dough. Leave to swell for about 20 minutes.
For the asparagus, wash and peel the asparagus and cut off the woody ends. Boil up plenty of water, salt and sugar in a large pot. Cover the asparagus and cook for about 15 minutes.
For the sauce, mix cream, 1⁄8 l water and sauce powder in a pot with a whisk until smooth. Bring to the boil while stirring. Remove from the heat and beat butter in pieces until melted. Wash the chervil, chop finely and stir into the sauce.
Drain the asparagus and let it drain. Heat clarified butter in portions in a small coated pan (approx. 20 cm Ø). Bake a total of 8 crêpes one after the other until golden brown.
Wrap 3-4 asparagus spears in 1 crêpe and place in a flat casserole dish. Drizzle Hollandaise sauce over it and sprinkle with ham. Gratinate in a preheated oven (electric cooker: 225 °C/circulating air: 200 °C/gas: see manufacturer) for 5-10 minutes. Serve immediately.