It is the secret ingredient of many a homemade meal. But the precise contents of this tangy relish itself have remained a mystery. Until now. After more than 170 years, the original recipe for Lea and Perrins Worcestershire Sauce has been revealed. It was found in notes dating from the mid-1800s that were dumped in a skip by the sauce factory. Brian Keogh, a former Lea and Perrins accountant, discovered the notes, which were neatly written in sepia ink in two leather-bound folios, and rescued them. Today, the label on bottles of the sauce lists vinegar, molasses, sugar, salt, anchovies,...