Pack mushrooms into a sterile jar stir together remaining ingredients-mix well pour over mushrooms screw on lid to seal chill for several hours, inverting jar frequently.
Ingredients
1 lb button mushrooms
1/3 c olive oil
3 t red wine vinegar
1/4 c scallions
1 t garlic
1 t dijon mustard
1 t salt
1/4 t black pepper
3 t parsley