Worcestershire sauce is a fermented English sauce used as a condiment to enhance the flavor of various dishes. It is made from a mixture of ingredients including malt vinegar, molasses, anchovies, tamarind, onions, garlic, sugar, and spices. After fermentation, the sauce is aged, which gives it its complex, salty, sweet and sour, and seafood flavor.

Worcestershire sauce is commonly used in marinades, meat sauces, soups, and stews, and it's a key ingredient in some preparations like the Bloody Mary. While naturally gluten-free, some commercial versions may contain malt vinegar made from barley, which does contain gluten. Therefore, it's important to check labels to ensure it's gluten-free.

If you don't have any, you can replace it with a mixture of vinegar, smoked paprika and fish sauce.