That's right, the sauce is basically tamarind, fish sauce and palm
sugar.
Fresh sliced chili and bird's dropping chili are served on the side.
and sometime, the rice noodles is cooked in chili oil.
It is more like braised hor fun,
since the Thai start with semi dry noodles,
then add water to soften the noodles during
cooking. Quite different from Cantonese style
cooking. But it is good