Preheat oven to 400.
Roll out your sheet of puff pastry into a rectangle.
With the tip of a butter knife, gently score a half-inch border inside the rectangle; this is where you will place all the ingredients.
Top with lemon slices in an even layer.
Add asparagus stalks.
Fold puff pastry edges (from the scored border) over asparagus.
Place on a baking sheet line with parchment paper.
Bake at 400 for 20-25 minutes.
Remove from oven, drizzle Olio d'Natalia then dust with grated Parmesan.