This is a perfect picnic party sandwich. Just wrap your undressed sandwiches in waxed paper and then have your guests dress them at your event with the pineapple slaw.
Everyone knows that salads, like coleslaw, are better the “next day” after the flavors have had a chance to marry. I still like to have a little crunch in my slaw that sometimes is lost after sitting in the fridge for a bit. To solve this problem, I reserve one-fourth of the coleslaw mix or cabbage and add it the following day, so the slaw still has a bit of bite but is still full of flavor!