Pho is the safe answer. Banh mi is what you grab at the airport. If you flew 14 hours to eat soup you can get in Houston, you wasted a ticket. Vietnam’s food identity is regional, aggressive, and weirdly specific. The best dishes don’t travel well. They require a specific street corner, a specific charcoal fire, and a vendor who has made one thing for 40 years. This is the list I give friends who ask where to eat in Vietnam. No pho. No banh mi. Just the stuff that makes you rebook your return flight. Bun Cha Hanoi: The…