Christmas in Tuscany would not be complete without a slice of panforte — the peppery, dried fruit and nut-based spice cake born in the central Tuscan hill town of Siena in the Middle Ages — served with a glass of vin santo, a sweet Italian dessert wine. Several legendary origin stories surround panforte. Some culinary historians believe it was inspired by lokum, aka Turkish delight, the ancient date- and nut-based confection popular in different forms in several Middle Eastern countries to this day, brought back to Tuscany by medieval-era crusaders. According to local lore, Sienese soldiers won the Battle of...