Pinzon White Ceramic Butter Keeper [Amazon Frustration-Free Packaging] for $10.99

In France, crocks known as beurriers have been used to store butter since the Middle Ages. Pinzon's glazed ceramic crock can keep butter fresh and spreadable for up to 30 days without refrigeration. Using the butter keeper is simple. Remove the bell-shaped lid, pack it with softened butter, fill the base with cold water, then replace the lid. Kept replenished, the water creates an airtight seal that prevents oxidation, maintaining the butter's freshness and softness.