Many family stories suggest that this humble sweet, made from just four ingredients, is a Depression-era creation born of frugal ingenuity. But it’s more likely that potato candy made its way to the South with Irish settlers and eventually to tables as a confection reserved for special occasions like Thanksgiving or Christmas. Oddly, the candy doesn’t taste much like sweet potato; in fact, it’s more akin to peanut butter fudge. Cooked sweet potato is simply a binder for nearly two pounds of powdered sugar, making this one very sweet treat.