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It's a type of wine. You could probably substitute sherry or some other rich sweet wine for that. Whatever you have access to. I would not use regular white or red wine, though. Cream Sherry would probably work well, too.
Shelly
If you have a dehydrator, you can use that and store them easier so they don't go bad. They don't freeze well.
Here is a Wild Mushroom Soup recipe. You can substitute the mushrooms you have for the ones listed. Here is the original link...