In my experience, lack of groceries or clean laundry is the mother of all invention. That's when the magic (or maybe just the weird) happens. I like to think of this phenomenon as a sign you're on your way to mastering paleo - you needn't be super prepared all the time, you simply have only real food at your disposal at any time.
Take for instance these yummy little hors d'oeuvres we had the other week. Like a little open faced sandwich even.
Final note: Both the mayo, and especially the meat in this recipe are histamine offenders. I tend to reserve this type of snack/meal for when my skin's been extra good to ensure I won't be overloading on histamine too much.