For the spinach pizza, place the defrosted puff pastry on a baking tray covered with baking paper moistened with water.
Prick several times with a fork and bake at 200 degrees for 8 minutes. Coarsely chop spinach, mix with salami, crème fraîche and season.
Spread mixture on puff pastry and bake again for 8 minutes. Sprinkle with cheese and put in the oven for another 1 minute until cheese is melted.
Serve the spinach pizza while still hot.