This is no joke! I went Friday, and on her grill there were some brown patties that looked like hamburgers; and when I asked what they were one of the onlookers said they were hamburgers (the Arepa Lady herself didn't know the English word). There were also (in addition to the usual large yellow and Englis-muffin sized white arepas) large white arepas looking somewhat like tortillas, but thicker. When the large white ones were done, after slathering on the usual butter and cheese (and a shake of salt), the Arepa Lady would put a hamburger on top of the cheese-covered arepa, and that's how customers would eat them (even though the hamburgers were about half the diameter of the arepas). I didn't order one myself, sticking to my favorites instead, but they seemed to be popular; all three of the combos cooking when I arrived were bespoke by waiting customers, and in fact nobody but me ordered anything else while I was there. Has anybody here had one of these? How was it?
Incidentally, I got there about 11 P.M., and there was a pile of already-cooked large yellow arepas on the corner of the grill. When I ordered one, the Arepa Lady took one from this pile and briefly reheated it, and it wasn't quite as good as the freshly-made one I'd had on my first visit. So I'd suggest coming early.