Salted Butter

Though we prefer unsalted butter for most recipes because it allows finer control over flavor and texture, most of the butter sold in the United States is salted. We use salted butter as a condiment for foods like corn on the cob, biscuits, or toast when we want extra-salty, savory flavor. Since most of the times we use salted butter are when butter flavor needs to be front and center, we wondered: Is it worth shelling out more for “premium” salted butter?

To find out, we selected six nationally available products and one top-selling regional product (which is available in only 34 states but ranks second in total national sales). We asked 21 America’s Test Kitchen staffers to sample the butters plain, spread on crackers, and melted over toast.

We tallied the scores and found that we liked all the butters we tried, but it was clear that some products were in a league of their own. What set the best butters apart? Since all the products in our lineup have simple ingredient lists of just cream and salt, we looked first into the most obvious variable: salt content. But that yielded no answers—tasters scored products with comparable levels of salt vastly differently.

As we examined nutritional labels, we noticed a handful of lower-ranked products with a shield on their box indicating a “Grade AA” rating by the U.S. Department of Agriculture (USDA). Curious why this label was absent from our favorite butters, we contacted Robert Bradley, professor emeritus of food science at the University of Wisconsin. It’s often rumored that salted butter is made from lower-quality cream than is unsalted butter, but Bradley quickly dismissed that suggestion and said that the USDA doesn’t require manufacturers to grade their butter (or the cream used to make it), and a rating doesn’t necessarily guarantee a better butter. “There’s a lot better cream today going into butter manufacturing than we’ve ever had,” he said. “Handling and storage conditions have greater potential for off-flavor development than the quality of the cream used.”

Bradley confirmed what we learned from previous butter taste tests: Packaging has a huge impact on butter’s flavor potential. “Butter, like any other fat product, is a sponge for off-flavors,” he said. If not properly protected, butter quickly absorbs odors from its surroundings—usually whatever else is in the fridge. The majority of butter is packaged in either foil or wax parchment, with foil offering far greater defense from funky odors. “Parchment does next to nothing in protecting the butter,” Bradley said. “Those wrappers are as porous as a summer screen on your window.”

It wasn’t surprising, then, that the but... read more