Local Food in Bangkok

The day we went out in Bangkok to see all the temples and palaces, a
family friend of Naiem's was nice enough to take us around and show us
the sights. He also took us to an 'authentic' food place for lunch.
This place was pretty hidden and we would have never found it
otherwise. I was a bit nervous but was willing to try anything.

This is what the place looked like from the outside.