Make sure to complete thaw the puff pastry in the refrigerator before using it in this recipe.
Use 200 g of gruyere cheese.
Use 400 g of mixed mushrooms, porcini mushrooms or your favorite mushrooms.
Add 2 tbsp of unsalted butter and 1 tbsp of olive oil extra virgin to the mushrooms.
Use 3 twigs of fresh thyme.
Use a little bit of egg to brush onto the outer edges of the pastry. The eggwash is what gives the pastry the perfectly browned edges.
