Cut off the bottom 2 cm from the washed asparagus and steam the asparagus in a little water for 10 minutes.
Mix the ingredients for the hollandaise cream in a blender. Transfer the mixture to a small saucepan and bring to the boil, stirring constantly, until the sauce thickens into a cream.
Roll out the puff pastry on a baking sheet and brush with the cream. Leave 1 - 2 cm space towards the edge. Spread the asparagus on the cream.
Bake the tart in a preheated oven at 180 ° C top / bottom heat for about 20-25 minutes until the puff pastry begins to turn brown.