Mix the flour, milk, 2 eggs and a pinch of salt well, stir with a whisk or hand mixer to form a smooth dough and set aside so that it can swell.
In the meantime, peel the asparagus and cook it in water with lemon juice.
In between, bake the pancakes in a little oil in a coated pan. Then place a slice of boiled ham on each pancake, wrap 3 thick or 4-5 thin sticks of cooked asparagus in them.
Mix the grated Emmentaler with the Hollandaise sauce, spread the mixture thickly on the asparagus rolls and bake the whole thing again at 200 degrees for 10 15 min. Lightly brown.
Can be served with boiled potatoes, but is powerful enough without a side dish.