Peel the asparagus and cook in salted water for approx. 10-15 minutes (not too soft!).
Wrap each asparagus stick in a thin slice of raw ham and secure with a toothpick.
Place the rolls side by side in a buttered gratin dish, sprinkle with the grated cheese, top with flakes of butter and gratin in the oven at approx. 180 ° C top / bottom heat until the cheese has reached the desired browning.