In the bowl of a stand mixer fitted with a paddle, beat the 3 sticks (12 ounces) unsalted butter and the 1 tablespoon all-purpose flour together until creamy and combined, 2 to 3 minutes.
Laminate and fold the dough
Remove the dough from the refrigerator, unwrap it from the plastic, and place it on a lightly floured work surface. Roll the dough into a 12-by-20 inch (30.5-by-50 cm) rectangle. Spread the butter-flour mixture evenly over the entire rectangle, leaving a 1/2 in (12 mm) border around the rectangle.
Make the first turn, or letter fold: Starting with a short side facing you, fold one-third of the dough onto itself, making sure the edges are lined up with each other. Then fold the remaining one-third of the dough on top of the side that has already been folded. Rotate the dough so the seam is facing to the right and one open end is facing you. Gently roll the dough into a 10-by-18 inch (25-by-46 cm) rectangle. (Each time you roll, the rectangle will get a bit smaller.)
Repeat the letter fold. Sprinkle flour on a sheet pan or plate, place the dough on it, and freeze the dough for 6 minutes—set a timer so you don’t forget (this helps cool the dough slightly and makes the last turn less messy).
Remove the dough from the freezer and repeat the letter fold again, making sure the seam is facing to the right. Roll the dough again into a rectangle, about 8-by-16 inches (20-by-40.5 cm). Repeat the steps for one letter fold. Gently compress the dough with the rolling pin.
If using the dough immediately, place it in the freezer for 6 minutes to chill, then proceed with the recipe. Otherwise, wrap the dough in plastic wrap, place it in a freezer-safe bag, and freeze for up to 2 weeks. The dough can be removed from the freezer the night before using and placed in the refrigerator to thaw.