Place the mushrooms in a large skillet over medium-high heat. Cover with water and add the vinegar. Bring to a boil and cook 2 minutes. Drain and allow to cool before finely chopping.
Place the mushrooms in a mixing bowl. Add the mayonnaise, sour cream, garlic, salt, pepper and parsley, if using. Stir until smooth. Refrigerate until ready to use.
Author:
Recipe by The Tennessee Magazine at https://www.tnmagazine.org/fascinating-fungi/