Clean mushrooms by wiping with a damp towel. Trim off stem flush at base of cap and reserve for another use.
Combine remaining ingredients in a large bowl. Add mushrooms and toss to evenly coat. Transfer to a container and press mushrooms down until liquid rises to the top. Cover tightly and refrigerate for 2 to 5 days. To serve place on a platter with toothpicks, sprinkle with chopped parsley.
c.1997, M.S. Milliken & S. Feniger, all rights reserved