I've never been to Vietnam, so I can't speak to the authenticity of this place, but Banh Xèo Minh at 1308 Belanger has Banh Bèo along with a bunch of other Vietnamese dishes less often seen in this town. I highly reccomend the house specialty: Banh Xèo. It's a large crepe with porc and shrimp filled with bean sprouts and served with lettuce and fresh herbs. It's quite tasty and refreshing. If you asked nice perhaps one of the kindly ladies working there will make you a soursop milkshake to go with it.