The edge of Chinatown and North Beach, where Columbus and Grant avenues meet like two mighty rivers, is one of the most dynamic liminal zones in San Francisco. Few locals spend good time at this dueling precipice, but consider just one block. Sam’s Burgers, Anthony Bourdain’s favorite late-night burger in

I noticed faux Donut ‘plushies’ for sale, before my eyes rested on the colorful eatable Mochi Donut display. So many questions! Even though it was almost closing time, the friendly staff spent time educating me about the Mochi Donut.