Pickled-plum soda. Azuki bean. Soy sauce. Wasabi. For years, Japanese Kit Kat bars have been infused with decidedly local flavors (some 200, if you’re counting). We’re crazy about this recent arrival: cherry-blossom green tea (kitkat.com; from $1), a cream-filled wafer dipped in chartreuse-colored white chocolate. It’s one of Japan’s sweetest souvenirs.