Ok, next Wednesday is a absolutely ridiculous "holiday" created by math educators called "Pi Day" (it's 3/14, get it?) Anyway, I teach at a college and usually bring in something for my students. Two years ago I did apple empanada-type pies, last year I did mini key lime pies and mini chocolate pudding pies (but none of them had ever tried a key lime pie before and didn't want to try them!)
This year I'm back to the empanada idea unless I can come up with something better. These are college kids, they'll eat just about anything, so they don't have to be fancy, but they need to be small, portable, and fairly simple to make as I don't have a lot of time the day before to do them. I can always do cookies as they're round and make them just calculate stuff with them but I'd rather not.
Oh, I'm also doing pizza pies this year so this won't be the only food they see all day.