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In page Worcestershire sauce:

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Although soy sauce is used in many variations of Worcestershire sauce since the 1880s,[citation needed] it is debated whether Lea & Perrins has ever used any in their preparation. According to William Shurtleff's SoyInfo Center, a 1991 letter from factory general manager J. W. Garnett describes the brand switching to hydrolyzed vegetable protein during World War II due to shortages.[9] As of 2021, soy is not declared as an ingredient in the Lea & Perrins sauce.[10]