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["Using a stand mixer fitted with the dough hook (or a hand mixer), mix together the milk and yeast on low speed for 5 to 10 seconds to dissolve the yeast. Add the all-purpose flour, bread flour, salt, sugar, and the 2 tablespoons soft butter and continue to mix on low speed for 3 to 4 minutes, or until the butter is fully incorporated and the dough is smooth. Remove the dough from the mixer bowl, place it on a tray, and cover it loosely with plastic wrap. This dough block is called the detrempe. Place the tray in the refrigerator for at least 6 hours or for up to 12 hours. The dough will firm up and the yeast will take some action and proof a bit.", "At least 6 hours later, put the", "on a well-floured work surface, and then press down firmly to create about an 8-inch square. Rotate the square so that, as you face it, it looks like a baseball diamond. Use the sides of your palm to mark a 7-inch square in the middle of the diamond, creating triangular flaps at the 4 corners.", "As best you can, roll out each of the triangular flaps into a squarish shape (about 3-inch squares). You will have to tug a bit at the edges to pull the flap into a square as you roll. When you are done, the entire piece of dough will be about 12 inches wide and tall, with a 6-inch-square lump in the middle and one squarish flap off of each side of that lump. The 6-inch-square lump will be about 1 inch thick, and the 4 squarish flaps will be about 1/4 inch thick.", "Place the 1 cup cold butter in the stand mixer fitted with the paddle attachment, and beat on medium speed for 15 to 20 seconds to break up the butter, yet still keep it quite cold. (Alternatively, pound the cold butter with a rolling pin to soften it and shape it into a 6-inch square.) Scrape the butter out of the bowl directly onto the 6-inch-square lump in the center of the dough, and pat it with your fingers into a square that covers the 6-inch-square lump. The butter should be about the same consistency as the dough.", "Fold one of the flaps up and stretch it over the butter square to cover it entirely. (The dough is quite stretchy, so you can stretch it to cover the butter completely.) Fold and stretch a second flap over the first flap, then repeat with the third and then the fourth flap. Tug at the flaps to keep them in a square that covers the butter. You will now have a butter square that is entirely encased in dough above and below. Using the palms of both hands, firmly press down on this dough package to create about an 8-inch square.", "When the dough package is relatively flat, switch to a rolling pin and continue to flatten the dough by pressing up and down on the package with the pin. Roll out the dough into a rectangle about 16 by 10 inches. As you work, flour the dough and the work surface as needed to prevent the rolling pin from sticking to the dough.", "Position the rectangle so a long side is facing you. Using a bench scraper or a knife, score the rectangle in half vertically, to create two 10-by-8-inch rectangles. Brush any loose flour off the dough. Lift the right side of the dough and fold it in, so the right edge meets the scored line in the center. Then lift the left side of the dough and fold it in, so the left edge also meets the scored line in the center and meets the right edge, as well. Square off the folds as much as possible so the edges meet neatly, then fold the right half of the dough on top of the left half. This is called a book fold. Your dough will now be 4 inches wide, 10 inches from top to bottom, and about 2 inches thick. Rotate the dough pile clockwise 90 degrees; it will now be 10 inches wide and 4 inches from top to bottom. The process of folding and rotating is called ""turning the dough.""
