Use approximately twice the weight of all purpose flour (preferably organic) to unsalted butter. Some recipes call for half butter, half lard
Sift the flour and a pinch of sea salt
into a food processor
, then cut the cold butter into small pieces on top of it. I process it for 20 to 30 seconds, then add ice-cold water through the top, a tablespoon at a time, 2 to 2 1/2 minutes should be enough for about 10 ounces of dough, with the machine running. If the paste is still in crumbly little bits after 1 or 2 minutes, add a tablespoon more water, but remember, the more water you use, the more the crust will shrink if you bake it blind. One solution is to use a bit of cream or egg yolk instead of water. The moment the dough has cohered into a single ball, stop, remove it, wrap it in plastic wrap
and put it in the fridge for at least 30 minutes.
If you're making pastry dough by hand, sift
the flour into a large bowl with the salt, add the chopped butter, and work as briskly as you can to rub the fat into the flour. Use the tip of your fingers only, rather like running grains of hot sand through your fingers. Add the water bit by bit as above; wrap and chill the dough.
If you're making a double crust pie, divide the dough into roughly 2/3 and 1/3. Then scatter a bit of flour on your work surface, roll your rolling pin in it, dust
the palms of your hands, and start rolling. Always roll away from yourself, tuning the dough as you go, and keep the rolling pin
and work surface floured to prevent sticking.