- Preheat oven to 425F / 220 C 
- Line a baking sheet with parchment paper 
- Unfold the puff pastry and lay on the baking sheet. Prick the pastry all over with a fork. Brush with some olive oil and sprinkle with the dry Herbes de Provence. Sprinkle 1/4 cup basil leaves on top.  Add a layer of grated Gruyere cheese. Add the asparagus in a layer on top of the cheese. Drizzle olive oil on top, add salt & pepper. 
- Bake for around 25 to 30 minutes 
- Meanwhile, mix the arugula, remaining basil leaves with the lemon juice and olive oil, season with salt and pepper 
- When the tart is ready, add the parma or prosciutto ham on top and sprinkle the arugula/basil mixture on top.