Is the banh mi the world’s best sandwich?

The cab driver stopped on the bustling boulevard Pho Hue and pointed at a mishmash of incongruent four and five-story buildings across the street. I hopped out and dodged buzzing motorbikes and exhaust-belching cars, trying to get from curb to curb. Related article: In search of Miami's Cuban sandwichThen I spotted it: Banh Mi Pho Hue (118 Phố Huế; 84-4-3822-5009), the no-frills sandwich shop named for the Hanoi street on which it sits.