Argentine Grilled Steak

* Trim steak of fat. Marinate in mixture of wine, vinegar, oil, rosemary and pepper, one hour, at room temperature, turning two or three times.

* Heat barbecue. Remove steak from marinade and salt to taste. Grill steak over medium-high heat until done - about 8 minutes on each side for medium. Let sit five minutes and cut into 1/4-inch-thick slices.

* For sauce, slice mushrooms and saute in the oil until tender. Add remaining ingredients to pan and reduce about 3 minutes. Serve hot with sliced steak.

* This recipe yields 6 servings.