Years ago there was a little South American restaurant on Telegraph Rd. in Pontiac (it later became the East/West restaurant … run by the former defense secretary of South Vietnam … but I digress)

They had the most awesome sopapillas there.
I once asked the cook how they made them so good and he told me that a real (South American) sopapilla uses squash flour in the dough. The prices were dirt cheap and the food was fantastic it was a shame they closed.