Heat butter in a large skillet. When foaming subsides, add the garlic, mushrooms and saute for a minute or until mushrooms are coated with butter. Add a tablespoonful or so of white wine vinegar + 1 tablespoon of water. Cover and simmer for 4 minutes or until mushrooms are tender.
Uncover the skillet and evaporate the liquid. Stir in the parsley, cover and simmer until the parsley has wilted; season well to taste with salt and pepper. Serve with either one of veal recipes.