pour 8 oz flour in a mixing bowl or on a clean work surface
. make a hole in the middle, add egg yolk, salt and cold water. knead the mass well until it becomes firm.
place on a floured work surface. using a knife, cut a 3/4 inch cross into the dough.
cover the dough with the bowl and let stand for 30 minutes. using a rolling pin, shape the dough into 4 semicircles resembling flower petals. place the lump of butter in the middle, then cover with 1 of the semicircles.
press down on the edges of the semicircle to seal in butter. make sure that butter cannot escape through any holes of the dough pocket.
cover the pocket with the remaining semicircles. using the rolling pin, gently tap on the pocket so that butter spreads evenly. shape the dough into a long, about 1/2 inch thick rectangle.
flip 1 third of the rectangle toward the center. flip the other end to the center, like folding a business letter.
rotate the dough 90 degrees.
flip the left half over the right.
wrap the dough into a plastic wrap. chill in the refrigerator for 30 minutes.
after the dough has been refrigerated for 30 minutes, unwrap the dough. discard the plastic wrap.
repeat the folding and rotating process of the dough. make sure you roll out the dough in the direction opposite to the 1 of folding.
repeat the folding, rotating and refrigerating process of the dough two more times for a total of four times. if the dough becomes soft or sticky during this process, immediately refrigerate until firm.
after the fourth turn, wrap the finished dough in plastic wrap and refrigerate to make sure it is well-chilled before baking.
puff pastry keeps refrigerated for up to three days, or frozen for several months.
note: do not grease the baking dish when baking puff pastry............