Blend together oil, vinegar, garlic, oregano and salt. Cut each provolone slice into 6 wedges.
Arrange cheese, mushrooms and asparagus in glass baking dish. Pour dressing over cheese and vegetables. Chill.
Cover. Marinate in refrigerator 4 hours or overnight; spooning marinade over cheese and vegetables occasionally. Drain, reserving marinate. Arrange on serving platter. Serve with reserved marinade.
Makes 4 servings.
Cajun Country -- New Iberia, Louisiana