This brings me ever-so-nicely on to my question!
I've been listening to Coffi Du (the intro music for Level 3) and it contains the lyric:
"Tyd a coffi du i mi" which, the translation says, is "Give me a black coffee".
This confused me for a while, because the verb I know for "to give" is "rhoi", and even in short form or command form I would have expected something at least starting with R or Rh! After much searching, I've found something that says this is a northern form of "dere!" ("come!"), so...
... does this lyric actually translate literally as "Bring a black coffee to me" / "Bring me a black coffee"?