SWMBO is from Worcester.
It is Wooster Sauce..a long "o" sound.
Sadly the sauce is now part of Heinz, though it is still made in Worcester.
The label... I've just looked...says Worcestershire Sauce.
What is in it? According to Wiki...
Barley malt vinegar
Spirit vinegar
Molasses
Sugar
Salt
Anchovies
Tamarind extract
Onions
Garlic
Spice
Flavourings
The "spice" and "flavourings" are believed to include cloves, soy sauce, lemons, pickles and peppers.
It is fermented, reputedly then matured or 2 years.
It ages well, we normally keep a number of bottles and use when well past the "best before" date!
Found this on YouTube. Other than the US voice mis pronouncing Worcestershire ikt is quite good.
https://youtu.be/vAdAgHJ0aqI