in the bowl of a stand mixer fitted with the paddle attachment, combine the water, yeast, sugar, buttermilk, butter, honey, salt, and 4 cups of the flour. mix on low speed just until a dough has formed. switch to the dough hook. continue mixing on low speed, adding the remaining flour 1/2 cup at a time until a smooth dough is formed that clears the sides of the bowl. continue kneading on low speed until dough is smooth and elastic, about 4-5 minutes. transfer the dough to a lightly greased bowl, turning once to coat, and cover the bowl with plastic wrap. let rise at room temperature until doubled in 