There are multiple recipes for mushroom wine online, this: Novelty Wines Recipe
is special though as it describes the resulting flavour:
“After finding some people unexpectedly liked the chocolate wine, I was determined to make a really outrageous wine. Mushrooms were selling very cheap in the local market so I made a mushroom wine expecting it to be foul black in colour and musty tasting. I was surprised when it came out a clear elegant yellow and not very bad flavoured. I’ve even had a friend who did not notice this wine was not a normal white grape wine until told.”