Where is Saphan Sang Hi? (I know where Saphan Sung is.)

There should be several hundred restaurants within a few Km of any single spot in Nonthaburi or Saphan Sung which serve these dishes. In Yoawarat, assuming during the evening, just head down any lane/alley and look for a vat of boiling oil, some tables and some fresh pork basking in the warm evening temperatures.