Peppercorn Beef Burgers with Rosemary and Garlic Mushrooms - Sutter Home Family Vineyards

Ingredients

• 10 large mushrooms, chopped
• 3 garlic cloves, peeled and finely chopped
• ½ teaspoon chopped fresh rosemary
• 3 tablespoons butter, cut into small chunks
• ½ cup chopped shallots
• 3 tablespoons Sutter Home Merlot
• 2 tablespoons thyme
• ½ cup grated Gruyere cheese
• 2 teaspoons kosher salt
• ¼ teaspoon nutmeg
• 1 pound ground chuck
• 1 pound ground sirloin
• 6 tablespoons butter, cut into 6 equal pieces
• 1 tablespoon coarsely ground peppercorn spice medley
• Vegetable oil, for brushing the grill rack
• 6 tablespoons butter, softened
• 6 Kaiser rolls, split
• 6 romaine lettuce leaves