To prepare the dough using a food processor: pulse together the flour, salt and thyme until combined. Then add the butter and pulse until you have a rough breadcrumb consistency. Finally, add the water, a little at a time, pulsing, until the mixture forms a dough.
To prepare the dough by hand: in a large mixing bowl, combine the flour salt and thyme. Add the butter and using your fingers, rub into the flour mixture until you have a rough breadcrumb consistency. Add a little water and mix together until mixture forms a dough.
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