In a bowl, add the flour and salt, then add the butter. Cut thebutter binto cubesefore you add it to the flour, and it will make incorporating ittogether much better. Mix together, I like to do this with my hands, until thebutter is in pea-sized chunks.
In a separate bowl, whisk together the egg and vinegar and addto the flour mixture.
Add the water a little at a time. Add just enough sothe dough can hold together on its own. It may seem like you are"overwatering" but you want to make sure the dough holds together.
Allow the dough to chill for at least 15 minutes before rollingout in the pan.