French Butter Bells, aka butter keeper or butter crocks are the new modern way to store your real butter on the counter where it can stay soft and spreadable. Yes, you can start using butter again without it tearing up your bread, the secret is water!
The softened butter is packed into the lid, while some water is added to the basin. When the lid is placed on the bottom jar the water effectively seals the butter from air, which is the reason butter goes rancid. Not only does it protect your butter from air, but also from air borne critters and counter hunting kitties. The lid also serves as the perfect serving dish as well.
Dishwasher and food safe.
Read more http://yellowcottagestudios.com/refrigerating-your-butter-is-so-yesterday/