1/4 cup balsamic vinegar
1/3 cup water
1 small bay leaf
1/2 teaspoon sugar
1/4 teaspoon dried oregano leaves
1/4 teaspoon salt
1 medium clove garlic, halved
dash ground red pepper
1 pound mushrooms, cleaned & halved
Combine all ingredients except mushrooms in a medium saucepan, bring to boil over high heat, add mushrooms, stir, reduce heat, simmer, covered, 8 minutes or until tender.
Transfer mushrooms & liquid to glass bowl, cool to room temperature, cover, & refrigerate at least 2 hours. Remove mushrooms from marinade & serve.