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One of my more favorite resources is a book called "Substituting Ingredients" by Becky Sue Epstein and Hillary Dole Klein. They recommend a substitute for "wine in marinades" not sure if this helps for your recipe or not, but they suggest 1/4c. vinegar plus 1 tablespoon sugar plus 1/4 c. water.
Or, if you are going to the store, there are non-alcoholic white wines, as well as something, I think it's called Banyuls, something like that, that's a by-product of wine, used in the same way in recipes but I believe it is alcohol free. Good luck, beef wellington, YUM!



