Usually I used pitas but I forget to buy some once so I made popovers. It worked so well that I began to make them for every trip.
They stay good in a plastic bag for at least two days, maybe longer. They always get eaten before the second day is over. :)
I’m thinking the Gruyere popovers would make great sandwiches.
Already have the cheese....just have to add a compatible filling.
Maybe ham salad?