I double the recipe and put in a glass baking dish (9x13 inches). Nice for holidays . . . Keep it for a secret and family and friends will think you worked forever on it . . . (smiles). You can also use peanut butter chips and make peanut butter fudge.
These meaty mushrooms marinate in oil, onion, garlic and vinegar for an hour before they are tossed on a hot grill to cook to perfection. Absolutely sublime.