Creamy Brie cheese is combined with onion, spinach and tomato for the filling of this puff-pastry flan. It is best served warm with a tomato or crisp green salad.
Grease an 18.5 x 2.5 cm (7¼ x 1 inch) loose-bottomed flan tin. Preheat the oven to moderately hot 200°C (400°F/Gas 6). Roll out the pastry on a lightly floured surface to a 1 mm (1/16 inch) thickness, or as thinly as you can—thin enough to read through it—and li