Cut the woody ends off the asparagus. Wash the asparagus and cook in boiling salted water for 10-12 minutes. Meanwhile grate cheese. Drain the asparagus. Collect the cooking water and measure 1/4 liter.
Put asparagus water and milk in a pot and stir in the sauce powder with a whisk. Bring to the boil. Wrap each of approx. 4 asparagus spears with a casserole slice and place them in a greased casserole dish.
Pour gravy over it. Spread the cheese over the sauce. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 10 minutes. Cover the asparagus if necessary. Serve garnished with chervil as desired.
Delicious with baguette bread.