Source: Atlas Obscura
In 19th-century Salem, Massachusetts, no afternoon tea was complete without Gibraltar rocks. Also known as Salem Gibralters, or simply Gibralters, the tooth-threatening candy gets its name from the massive limestone promontory the Rock of Gibraltar.
Even with a hammer, the candy is hard to break apart, as you must invariably do after receiving a bar. At that point, though, the lemon or peppermint candy melts in your mouth.The manufacturing process has not changed much in several centuries. After boiling a syrup of sugar, water, cream of tartar, and cornstarch in a giant…
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