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Peanut Butter Is Steroids for Apples

The inaugural edition of our new series, ‘Why Is This So Good?,’ where we break down the deliciousness of unlikely food pairings

Some foods were born best friends — salt and pepper, peanut butter and jelly, chocolate and caramel. Others have more recently become best friends — pineapple and pizza, mango and chili, bacon and jam. But since most of us don’t have the wisdom of a Michelin-star chef, we’re breaking down some unlikely food pairings to figure out why they’re so freakishly good.

This edition: Apples and peanut butter.

According to Leah Brady, executive chef at Bar Struzzo in San Francisco, the harmonious relationship between apples and peanut butter relies heavily on the combination of sweet and salty flavors. “The sweetness of the apple is complimented by the saltiness of the peanut butter,” she explains. “They also go well together because salt brings out the flavor of all foods, which is why proper seasoning is important when cooking: If something tastes bland, chances are it needs a little salt.”

Science sides with Brady on this one: A study published in the Proceedings of the National Academy of Sciences suggests that our tongues have additional sweetness receptors that activate only when sugar is accompanied by salt. This explains why the salt in peanut butter can make an apple slice — especially a sweet apple slice — taste even sweeter (and therefore more delicious).

It also helps that we evolved to gravitate toward sweet foods, since they tend to be high in calories. Thus, a salt-enhanced ultra-sweet apple makes for an extremely satisfying snack, whereas a lone apple is just that — a lone apple, good at keeping doctors away, less adept at satisfying mid-afternoon munchies.

For the ultimate apple and peanut butter combination, Brady recommends green apples and crunchy peanut butter. “I like green apples for their tartness — that adds another level of flavor,” she explains. (Fun fact: The salt in the peanut butter actually suppresses some of the tartness, which in turn makes the apple both sweeter and slightly sour.) “I also much prefer ‘real’ peanut butter, which doesn’t have anything other than peanuts. Therefore, it actually tastes like peanuts and not sugary peanuts, so you truly get that nutty saltiness, which helps balance the sweetness or tartness of the apples.”

Brady is also a self-proclaimed spreader (rather than dipper). “I slice the apples into wedges and evenly spread the peanut butter over one side of each wedge,” she says. “The actual amount of peanut butter I put on each wedge depends on how sweet or tart the apples are.” Of course, how you combine your apples and peanut butter is a decision that only you make.

Now excuse me while I wash all this peanut butter and apple juice off of my hands, pants, keyboard, desk and everything else I’ve touched over the past 15 minutes.