Heritage Tomato, Mozzarella, Kalamata Olive & Thyme Tart

A sheet of ready-made puff pastry becomes the perfect crisp, buttery base for sweet heritage tomatoes, creamy mozzarella, salty Kalamata olives and thinly sliced red onion. Add plenty of fresh thyme, a drizzle of good olive oil and a little seasoning, and you have one of those wonderfully simple tarts that looks far more impressive than the effort involved would suggest.