For the asparagus with prosciutto, peel asparagus (for green asparagus, the lower third is sufficient) and place in two perforated cooking trays. Insert white asparagus first. 100°C 3 minutesThen add the green asparagus and cook both types together. 100°C 5 minutes.This gives a total cooking time of 8 minutes for the white asparagus and 5 minutes for the green asparagus.Peel the potatoes (if peeling potatoes a little earlier, place them in water to prevent them from discoloring), quarter them and place them in a perforated cooking tray. Cook the potatoes in a pressure steamer at 120°C for about 5-6 minutes. In a steamer: cook at 100°C for about 15 minutes. Heat the hollandaise sauce in a pot, add some white wine and whipped cream if necessary and season with salt and pepper.
Arrange asparagus, potatoes and prosciutto on warmed plates and pour hollandaise sauce over asparagus.