Maybe he means this
(pic by Gwiv)
It's what my records show as kha-nom-jean-ngyow. It's a beef noodle soup most popular in the North of Thailand. The key ingredient however is not beef as blood. The above pictrue is from Thai Avenue. The dish is not on the standard menu, but with a bit of prodding, you might get the folks there to cook you up some.
Even if this is not the soup in question, it's a pretty groovy mix that I have not had in ages but now crave.
Think Yiddish, Dress British - Advice of Evil Ronnie to me.