Autumn Potato Salad

I did that thing the other night, Halloween actually, where you're invited to a party and can't decide exactly what to bring. At first I said I'd bring a hearty salad of some sort, but as soon as I heard the word salad leave my mouth, ideas for savory tarts started flitting around my brain. And wow, is that a pâte sucrée tart shell in the freezer? Maybe I should make something with that. I also ...