Preheat oven to 200ºC and line a tray with baking paper⁠.

In a food processor or with a hand blender, blitz the olives, garlic, thyme, olive oil and vinegar together to form the tapenade⁠.

Roll out the puff pastry on to the baking paper and score with a knife a 2cm border around the pastry, so its sort of looks like a picture frame⁠.

Spread the tapenade inside the border of the pastry and layer the tomatoes, mozzarella and onion over.⁠

Bake for 25-30 mins until sides of pastry turn golden.⁠ Remove from oven and serve warm⁠.