Make The Dough
Combine the flour, sugar, and salt in a stand mixer fitted with a paddle attachment (or if mixing by hand, in a medium bowl). Add the butter and mix, on low, until the mixture looks sandy and there are no pieces of butter larger than a pea, about 2 minutes. The flour should hold together when you clump it with your fingers. Scrape down the sides and bottom with a spatula, if needed. (If mixing by hand, mix with a pastry cutter or two forks until the butter is mixed into the flour as above).
In a small bowl, mix the egg yolk and milk. With the mixer on low, add them to the flour mixture and mix until the dough just comes together, about 15 seconds; the dough will be somewhat soft. (If mixing by hand, add the yolk mixture to the flour and mix gently with a fork until the liquid is well distributed. The dough will still look crumbly and dry. Dump the dough onto a clean counter and work it with the heel of your hand, pushing and smearing it away from you and gathering it up with a bench scraper and repeating until the dough comes together and is pliable).
Turn the dough out onto a sheet of plastic wrap, press it into a flat disk, wrap it in the plastic, and let it rest in the refrigerator for 15 to 20 minutes before rolling it out.
Position a rack in the center of the oven and heat the oven to 350°. Line a heavy-duty rimmed baking sheet with parchment.
Remove the dough from the refrigerator; if the dough is very firm, let it sit at room temperature until it’s pliable enough to roll, 10 to 15 minutes. On a floured surface, roll the dough into a 13- to 14-inch round. It’s all right if the edges are a little ragged. Transfer the dough round to the baking sheet and put it in the refrigerator while you prepare the filling.
Dough recipe from finecooking.com | Image of table from Local Milk Blog