In the northwestern Italian city of Siena, the Palio is a twice-yearly horse race with religious connotations. In the North Texas cities of Mansfield and Fort Worth, Palio’s is a pizza joint with some unusual features. The family-owned restaurants offer a gluten-free crust option — scandalous for most pizza lovers but useful for those of us who have spent most of the last decade just eating the toppings off our pizza pies. There’s also a whole-wheat-crust option, and both restaurants, pleasantly, are BYOB, which is about as rare in the 817 as a twice-yearly horse race.