Pi day, a math-centric holiday originally celebrated by enthusiastic geometry teachers, has now also been co-opted by the pie-baking community as a welcome excuse for a savory or sweet slice in the Ides of March.

A decadent vegetarian entrée for a chilly winter evening, this pie will warm you, body and soul. The rich, savory flavor of this dish can support a heavily herbed gravy, so taste as you add, and don’t be afraid to be a bit heavy-handed!