I use a food processor to whizz the 150 grams/5 oz butter, 300 grams/10 oz flour and salt together until they look like breadcrumbs. About 10/15 seconds.Alternatively rub the butter into the flour with your fingers until it resemble breadcrumbs
Then add the water (5-6 tbsp) whilst pulsing. You may need to add more or less. As soon as it starts to come together tip it out onto a work surface and bring it completely together with your hands into a disc. See photos.Alternatively use a knife to mix in the water if you're working without a food processor.
Flour the work surface and begin to roll out into a circle of about 5mm thick. This pastry will easily roll out to fit a 23 cm dish with a little extra. I use the rolling pin to drape the pastry over to lower it into the dish. You can chill it for 30 minutes before rolling out but I never do!
Use the rolling pin to roll off the overhang and then press your thumb into each flute to un squash the top. Using a fork prick the base of the pastry all over. Line the pastry case and fill with baking beans to bake blind for 25 minutes.
Whilst your pastry is baking blind fry your chopped onion gently for about ten minutes until soft and golden. Set aside.
Remove your pastry from the oven.Beat your 3 large eggs together in a small bowl and then brush the bottom of the pastry case with a little of the beaten egg to seal all the holes. Return to the oven for five mins for the egg to set over the holes..
In a medium bowl add your eggs, 280 grams/10 oz cream cheese, salt and pepper and mix well. Add the onions onto the base of the pastry case and sprinkle in the 100 grams/3.5 oz mature cheese before pouring over the egg mixture.
Bake for 20/30 minutes or until golden and lightly scorched in places.
Apply to Heart Warmed Face
Notes
This can be kept for several days in the fridge and reheated gently.
Use a food processor it is much quicker and easier
Add the water carefully and double check it really does need more to come together before adding extra.
You want it to be quite soft and squidgy but not sticky
Use a rolling pin to move your pastry over to your dish
Patch up any holes with pastry cut offs.
Keep an eye on your pastry so that it doesn't start to burn around the edges in the oven