Preheat oven to 425 degrees.

Roll out the thawed puff pastry and cut into six 4” squares.

On top of each square place one slice of prosciutto and 3-4 stems of asparagus, and season with black pepper.

Fold the puff pastry corners towards the center, pressing to seal it closed.

Whisk one egg with a tablespoon of warm water, and use pastry brush to lightly coat the dough with an egg wash.

Bake in a 425-degree oven for 17-20 minutes, until pastry is golden brown.