Combine all of the ingredients, except the salt, in a small bowl, whisking to combine. Season with salt, to taste, then chill until you're ready to serve.
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Notes
The prepared horseradish you are looking for comes in a jar, often in the section of the store where they stock pickles. The jar should ideally contain just horseradish, vinegar, and salt. Beet horseradish is okay, but make sure you don't get horseradish sauce or a variety that contains dairy, as it will not give you the right results.Conventional Worcestershire sauces contain anchovies, but a lot of store brands are vegan, because anchovies are a pricier ingredient. Just check ingredients to find one that's anchovy-free.