My favorite easy yet guest-worthy dessert to make: Simplest Apple Tart from Smitten Kitchen
Apple Pie Cookies from Smitten Kitchen, which I've been dying to try.
So now that you know how to celebrate the glory of Pi Day... go forth and eat pie!
p.s. Interested in learning how to make pie even better? I hear Ann Arbor's famous Zingerman's has an incredible pie class. I took the Cinn-ful cinnamon rolls class and absolutely loved it.