Roll out pastry, 25cm x 30cm, on a lightly floured surface.
Place on a sturdy baking sheet. Score a 2cm border around edge. Prick inside border with a fork. Chill for 30 mins.
Preheat the oven to 220°C / Gas Mark 7.
Put the gammon slices over the pastry, then the brie slices.
Season well and arrange tomato slices on top.
Drizzle with the oil and sprinkle the pine nuts over the top.
Bake for 35 mins until golden.
Eat warm or cold.