Cut the zucchini into a lozenge shape or lengthwise and fry them.
Pepper and salt them.
Roll out the puff pastry on a baking sheet lined with baking paper (8 inches = 20 cm)) so that there is enough pastry in order to fold them onto the pie like a border.
Arrange a layer of fried zucchini on the bottom of the puff pastry, on top of this layer lay some mozzarella slices and on top of the mozzarella lay down the 4 slices of Swiss cheese.
Cover with the remaining layer of zucchini and sprinkle with the shredded cheese blend.
Fold the edges and bake at 180°C (356°F) for at least 40 minutes.
You can enjoy it hot or cold, for preference sake.