Introduced to me by a Vietnamese colleague, the Hanoï Bun Cha at Uncle Ho's is as authentic as in Hanoi! Dip the noodles and veg into the sweet savoury sauce and enjoy! This place is the CBDs best kept Vietnamese secret.
Their bahn mi is very authentic and delicious and worth ordering as well. Their pho however is northern style and so not as herby as the southern style (which is less to my preference). Highly recommended!