Preheat the oven to 425F.
Start by trimming the ends off your fresh asparagus. Toss the asparagus in olive oil, salt, and pepper.
1 bunch asparagus, 1 tablespoon extra virgin olive oil, kosher salt and black pepper
Unroll the puff pastry onto a baking sheet and cut into six squares.
2 packages puff pastry dough
Arrange the prosciutto, then the asparagus, then the shredded cheese at an angle on top of the puff pastry.
8 ounces Gruyere, shredded, 12 thin slices prosciutto
Gently fold the puff pastry corners together and seal them with wet fingertips.
Repeat until all six bundles are assembled.
After brushing the top of the bundles with the egg wash, season them with a little bit of pepper.
1 egg beaten
Bake for 12-15 minutes until the puff pastry is golden brown and the cheese is melted.