Add the white wine to a mixing bowl. Then add water and cornstarch. Whisk well until the cornstarch dissolves completely and no lumps remain.

Add salt, sugar, minced ginger, minced onion, minced garlic, and dry sherry into the bowl. Whisk again to combine.

In a spice grinder, grind the whole black peppercorns and mustard seeds until coarsely ground. Do not add any liquid while grinding.

Add the ground spice mixture and red pepper flakes to the bowl. Mix well until fully combined.

Your White Wine Worcestershire Sauce is ready to use. Pour into a clean container with a lid and refrigerate until needed.