Remove one part of the dough from the refrigerator, and roll it over a lightly floured work surface into an 18x10-inch rectangle. About 1/4-inch thick.
Use a shape knife, or a pizza cutter to trim the edges of the dough, then cut the dough into 8 (or more for smaller pastries) squares, each about 4x4-inches.
Line a large cookie pan with parchment paper, then gently lift the dough squares and place them over the lined pan.
Remove the filling from the refrigerator and transfer it to a large pastry bag. Pipe, or use a spoon, to top each square with a dollop (about 1.5 tablespoons) of filling, placing it about 1 inch away from the diagonal corners of the dough.
Fold the opposite corners of the dough making sure over the filling (kind of like a hug), making sure to leave some space between the sides of the dough and the filling for the filling to spread.
Fold the opposite corners of the dough over the filling (kind of like a hug), leaving a little space between the dough and the filling so it has room to spread.
Brush the dough with the extra egg yolk, and set it aside to rest for about 45 minutes.repeat with the second part of the dough Preheat your oven to 350°F (180°C) about 25 minutes beofre baking.
Bake the pastries over the middle oven rack for 18-20 minutes turning the pan mid baking.
The pastries are ready when the dough is golden brown (not too deep brown), and the filling id puffed but not golden. Remove from the oven and set a side to chill for about 20 minutes before serving.