Preparation time: 40 mins
Cooking time: 30 mins
1. Preheat the oven to 190°C. To make the pastry, put the flour, butter and salt in the Braun Multiquick's compact kitchen machine with kneading hook and pulse on a high speed until the mixture resembles breadcrumbs.
2. Add the egg yolk and cold water through the filling tube while the motor is running until it forms a dough. Remove the dough from the machine, wrap in cling film and leave to rest for at least 15 minutes in the fridge, then roll the pastry out thinly on a floured work surface to about 2mm thickness.
3. Line a baking tray with the pastry and prick the pastry with a fork. Brush the edges with the beaten egg to glaze then put back in the fridge to chill for 20 minutes.
4. Cook the leek slices with the butter in a saucepan over a low heat until just soft. Put the cheese, bacon, eggs yolks, cream and nutmeg in a bowl and mix well. Add the cooked leeks and season with salt and pepper. Pour mixture into the prepared pastry case and bake in the oven for 20 minutes.