Sourdough Banh Mi is a thing here - I was right (with reference to my post on Yeast Side) and I am glad to report that they are great, at La Saigon it is always sweetened with burpplebeyond.
For the sourdough advocates, having sourdough Banh Mi made this substantial and I loved the generous Vietnamese pickled slaw with fish sauce and chicken thigh like chunks in my order. I can’t wait to be back to try to coffee!