At lunch time, long queues are snaking outside of Vietnamese bakeries across Sydney. (ABC News: Abbey Haberecht)

Nine years ago, Rowan from Sydney's inner west started the Facebook group Vietnamese Banh Mi Appreciation Society on a whim. Now, the Facebook group of 155,000 members reviews and recommends the sandwich across Australia.

"It's so nice to see people rave about their favourite banh mi from across Australia, including small country towns in the middle of nowhere," Rowan said.

In Sydney specifically, the love for banh mi is apparent by the long queues snaking outside of bakeries across the city in suburbs like Cabramatta, Marrickville and Ryde.

ABC News reported that banh mi is one of many success stories within the Vietnamese community. It brings additional flavor to the multicultural society of Australia.