The correct spelling in Thai (eg "what they say") is right in the post of Marin, at least he got the first word righ. The exact spelling is, of vouse, ราดหน้า, ราด = to pour, หน้า = topping, makes together "topped noodles", or in english, boat noodles, because the topping sits in a kind of noodle nest). While it might sound like an 'l' to the unadjusted ear of a westerner, it certainly is not (ลาด = slope, which would not make any sense at all). If you are in Bangkok, this would be even a rolling 'r', so unmistakable. And while you are right that there is no officially recognized system for romanization -- the Thais never thought this necessary, because TiT -- this does not excuse to hold to a mistaken belief after it was proven wrong. In this case, literally, in writing.