Grilled Halibut Portabella Burger

4 lbs Halibut Steaks (3/4 to 1-inch each)
8 oz. Fresh Portabella Mushrooms, sliced
2 tablespoons Balsamic Vinegar
2 tablespoons Filippo Berio Olive Oil
1 teaspoon Dried Oregano
¼ teaspoon salt
4 sheets Heavy Duty Aluminum Foil

Preheat grill to medium-high. Place one steak on each sheet of aluminum foil.

In a bowl, combine remaining ingredients. Let stand for 5 minutes. Spoon ¼ of mushroom mixture over each fish steak. Bring up sides of soil and double fold. Double fold ends to form a packet, leaving room for heat circulation.

Grill 12-14 minutes in covered grill.