Grilled Steaks with Mushroom Wine Gravy

Ingredients

• 1 teaspoon salt ( or to taste )
• 1 teaspoon pepper ( or to taste )
• 4 boneless beef strip steaks , 1 inch thick about 2 lbs
• 1 lb mushroom , quartered
• 2 tablespoons butter
• 1 onion , chopped
• 3/4 cup red wine
• 1/2 cup beef broth
• 1/4 teaspoon thyme
• 1 tablespoon cornstarch
• 2 tablespoons water
• 1/4 cup chopped fresh parsley