Add all the remaining ingredients, except the butter, and using a dough hook, mix at a low speed until blended, and then add the butter. Knead at medium speed until silky but sticky, about 5 minutes. Keep in mind that the dough will not pull away from the sides of the bowl. Scrape the dough into an oiled bowl using and oiled spatula and cover with plastic wrap. Refrigerate overnight. The dough will not rise.