Fermentation crock

It has a gutter in the rim which is then filled with water so that when the top is put on an airlock is created, which prevents the food within from spoiling due to the development of surface molds.

Ceramic weights may also be used to keep the fermenting food inside submerged.

A fermentation tamper, a wide stick or dowel usually made of wood, may be used to pack food into the crock to keep it below the surface of the brine.

This article about kitchenware or a tool used in preparation or serving of food is a stub.

You can help Wikipedia by expanding it.