1.Preheat oven to 220°C (200°C fan-forced).
2.Place pastry on an oiled oven tray. Fold edges of pastry over to make a 5mm border all the way around pastry. Prick pastry base with fork. Place another oven tray on top of pastry; bake 10 minutes. Remove top tray from pastry. Reduce oven to 200°C (180°C fan-forced).
3.Meanwhile, combine spinach with half the cheese in medium bowl.
4.Top pastry with spinach mixture, beetroot and remaining cheese.
5.Bake tart about 10 minutes.