Office workers and leisure lunchers devour Vietnamese roast pork banh mi sandwiches from Nomnom ( www.nomnomtruck.com).

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Oddly, the banh mi has always been the one kind of food I liked better outside its home turf.

BBC: Is the banh mi the world��s best sandwich?

The chain also will have traditional Banh Mi Vietnamese sandwiches with green papaya slaw and chopped peanuts.

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Would my faith in the banh mi in its homeland be restored?

BBC: Is the banh mi the world��s best sandwich?

Is the banh mi the best sandwich in the world?

BBC: Is the banh mi the world��s best sandwich?

Then when the Vietnamese sent the French packing in 1954, they put their own spin on the sandwich, adding slices of pork, herbs and pickled vegetables, and creating the banh mi as we know it.

BBC: Is the banh mi the world��s best sandwich?

The final stop, in Ho Chi Minh City (formerly Saigon), includes chef-led cooking classes and a street-food tour -- and boundless opportunities for trying snacks such as banh mi (sandwiches), pho (spicy noodle soup), goi du du (green papaya salad) and banh xeo (rice pancakes with pork and shrimp).

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