corn butter holder

Two common sealing methods are described: a double-layer silicone ring in the lid that improves the airtight seal for covered butter dishes, and the traditional French butter keeper water seal, where softened butter is packed into the lid and cold water is placed in the base to create an airtight barrier.

Some covered butter dishes are listed to fit a full butter block about 6 × 4.75 inches; other listings provide overall dish dimensions—for example, roughly 2.25 × 4.75 × 5.5 inches.