most restaurants I have been in have had "Mexican coffee" on the menu for better than 10 years..in fact it's probably been at least 25 years since the first time I saw it offerred. And the first place I ever saw it listed on a menu was in an Irish Pub in NYC.
Some folks just don't get out much! (other than to WalMart so they can post a thread telling us how much they hated it!)