Don't know if Roy Harper can be confined to the folk genre--his music touches on other styles--but I think this track qualifies. Roy has a low opinion of the cuisine at a (in)famous truck stop restaurant off an English motorway: "The Watford Gap/The Watford Gap/a plate of grease and a load of crap"
https://www.youtube.com/watch?v=hY34XCQB26Q