3: Gather the dough into a ball and flatten this into a "cake", then place on a sheet of cooking parchment.
4: Lay a second sheet of cooking parchment on top and roll out the pastry between the two sheets of paper with a rolling pin...
5: ...until it is the right size for your tart dish or tin. Refrigerate the pastry (still between its sheets of paper) for at least 1 hour. Note: the pastry can be made to this stage the day before.
6:
Prepare the filling
Prepare and chop 1 shallot. Prepare and chop 300 g endives (head of chicory). Prepare and chop 1 leek, keeping just the white part (you can use the green leaves in another recipe).
7: Pour 3 tablespoons olive oil into a large frying pan on medium heat. When hot, add the chopped shallot, salt and pepper, and cook for 1 or 2 minutes without colouring.
8: Add the endives and leek, mix well and cook for 2 or 3 minutes.
9: Pour in 300 ml liquid cream, salt and pepper again, then turn down the heat and leave to reduce gently for 5 minutes. Check the seasoning, then leave to cool. Note: this filling can be prepared the day before.
10:
Cook the tart
Preheat the oven to 390°F (200°C). Line the tart tin or dish with the circle of pastry.
11: Pour the filling into the pastry case.
12: Bake for 30 to 40 minutes. Do watch the colour of the top, which should just be nicely browned. Serve either warm or cold.