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Butter Keepers

Butter keepers promise to keep sticks fresh-tasting, so we stored unwrapped butter in seven keepers ($5 to $35) for several weeks and tasted them daily.

What We Learned

Keeping an unwrapped stick of butter on hand makes buttering toast, greasing cake pans, and slicing off a pat mid-sauté fast and convenient. But butter’s high fat content means it readily picks up off-flavors, whether it’s onions, last night’s chicken, or the staleness of the fridge. Butter keepers promise to keep sticks fresh-tasting, so we stored unwrapped butter in seven keepers ...