Your feelings about mathematical constants may vary, but the love of pie remains steadfast and enduring. Take your pick from this selection, way more than 3.14159 in number. There’s the Cornish stargazy, if you like a fishy surprise popping out of your pie. Or you could go for the Russian kulebyaka, favored by Gogol and Chekhov. If you’ve no appetite for savory pies, why not try the raisin-filled Amish funeral pie or the delicately sweet South African melktert instead? There are pickle pies, pie sandwiches, tangy citrus pies, and even two pies baked into a massive cake. These 20 pies will sate every appetite. Q.E.D.