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 ... read more