Those came out the second time I worked there - was there for my senior year in HS and then again the summer after my Freshman year in college - would have been '86. Pain in the ass to make because the fried flour flat shells were a bit fragile and if the beans had been on the steam table for too long they would get a little dry and not spread very easily. So, while I didn't like making them too much, I did enjoy eating them. Of course, I'd hit them with a little nacho cheese and extra olives. Wash it down with a Pepper-Dew (half Dr Pepper, half Mountain Dew).
Damn - the things one picture makes you remember.