Place flour, salt and butter into TM bowl and blend 6 sec/speed 6.
Add egg yolk, turmeric, mustard and water and blend 6 sec/speed 6.
Scrape this out onto the floured silicone mat. Wrap and refrigerate for at least 30 minutes. This gives the flour and water enough time to develop gluten and the pastry will be much easier to handle.
Roll out to fit the tin of your choice. Use as per recipe suggests.