1/2 cup dry vermouth

1/2 cup vegetable oil

1/2 cup red wine vinegar

1 clove garlic clove, crushed

2 tablespoons onions, chopped

1 tablespoon dried basil

1/2 teaspoon salt

1/2 teaspoon pepper

1/2 teaspoon sugar

1/2 teaspoon dry mustard

 

Put mushrooms in a jar.  Combine remaining ingredients and mix well.  Pour over mushrooms.  Seal and store in refrigerator.  Will keep several weeks.