Two day process, first day is easiest (about 30 minutes).
1. With a stand mixer fitted with the paddle , mix the ingredients (except cold butter and 2 tablespoons flour) until shaggy.
2. Switch to dough hook on mixer and knead for 1 to 2 minutes until smooth. Dough will be sticky. Place in lightly oiled bowl (red ceramic bowl) covered with plastic wrap and chill overnight.
3. The next day, cut the folding butter into 1⁄2-inch pieces, sprinkle with the 2 tablespoons flour, and pound between two pieces of parchment with a rolling pin. Be sure to keep the butter cool. Shape into a 6x6 inch square about 1⁄2 inch thick. Return to the refrigerator if your butter feels too soft (During warmer months, parchment + plate in fridge)
4. Place the dough on your lightly floured work surface. Roll the dough into a 7x14 inch rectangle.
5. Start with the narrow edge nearest to you. Place the butter square on the bottom half of the dough, and fold the top half over the butter. Lightly seal the edges, and tap with the rolling pin to even out the thickness
6. Turn the dough one-quarter turn so the fold is on the left and could open like a book Roll the dough, keeping about the same width, to 24 inches in length. Fold the dough into thirds, as you would a letter. Tap the dough to even the thickness, and turn again so the fold is on the left side. You’ve just completed one turn!