Directions

1. Grease a 23cm loose-bottomed tart tin.

2. For the pastry, sift the flour into a bowl, then add the softened butter, parmesan and a pinch of salt. Gently rub the butter into the dry ingredients using your fingertips until the mixture resembles fine breadcrumbs. Mix in the egg yolk and add 2-3 tablespoons of cold water to bring the dough together. Form the dough into a ball then flatten into a disc.

3. Roll out the pastry on a lightly floured work surface to make a circle large enough to fit over the tart tin and approximately the thickness of a pound coin.

4. Use your rolling pin to lift the pastry into the tin and gently push the pastry into the base of the tin, pushing it right into the edges. Prick the base with a fork. Leave the pastry overhanging the edge of the tin, but trim any excess pastry that hangs down far enough to touch the work surface (as this will burn when cooked). Transfer to the fridge to rest for 30 minutes.

5. Preheat the oven to 180C/350F/Gas 4. Remove the tart tin from the fridge. Line the base of the pastry with baking parchment and fill with baking beans. Blind bake for 20 minutes.

6. Remove the pastry and take out the parchment paper and baking beans. Brush the pastry with the reserved egg white. Return to the oven for five minutes, or until the pastry is a light golden-brown color. Remove the pastry from the oven and leave to cool. Trim off any excess pastry from the edges with a sharp knife.

7. For the filling, heat a tablespoon of olive oil in a large frying pan. Add the bacon lardons and fry gently for 5-6 minutes until golden-brown. Add the leeks to the pan and cook gently for 15 minutes, stirring occasionally, until softened. Season with freshly ground black pepper. Spoon the leek mixture over the bottom of the pastry case.

8. Reduce the oven temperature to 160C/325F/Gas 3.

9. Mix the eggs, cream and a pinch of salt and pepper together in a bowl and whisk to combine. Pour into the pastry case and sprinkle over the grated cheese.

10. Put the quiche onto a baking tray and bake in the oven for 25-30 minutes, or until the filling is just set. Leave to cool for a few minutes then cut into wedges and serve.