Had to look up "sow's matrices."

> A "sow's matrix" (or vulva in Latin) is a dish from ancient Rome consisting of the uterus of a sow (a female pig), often specifically from one that has never farrowed or that was slaughtered shortly after farrowing. It was considered a delicacy among the wealthy elite and was a common dish served at lavish Roman banquets and dinner parties, often used as a sign of luxury, wealth, and status.