A visit to Iran yields a stunning variety of culinary delights. Between the familiar kebab and the decidedly outré grilled lamb’s testicles, there’s a vast spectrum of foods: caviar, pickle, and smoked fish in the north; samosas, falafel and hot and sour shrimp in the south; noodles, flatbread and rosewater-scented ice cream across the country. Take a look at Iran’s place on the map and it’s easy to understand why the scope of native foods is so wide. Once the center of the Persia...