Why buy a vegan Worcestershire sauce when you can make it at home without so much extra added sugar and nonsense? The key to this version does come from one slightly unusual ingredient, but that's what puts this recipe over-the-top! This beefs up any seitan dish, and also helps mask any gluteny flavor.
Bring all ingredients to a boil then lower to a simmer for about 15-20 minutes, or until the liquid has been reduced by about 1/2. Cool to room temperature, then strain through a fine mesh into an airtight container. Store in the refrigerator for up to 1 month.