PHILADELPHIA -- Slice pizza shop in Philadelphia is putting a spin on the traditional 7 Fishes feast. And they are turning it into their latest pizza creation. South Philly welcomes Curiosity Doughnut popup The pizza has tuna, crab meat, anchovies, sardines, clams, shrimp, and mussels. While the 7 Fishes tradition takes place on Christmas Eve, the shop is offering this unique pizza all through December.