Phancy Philly Cheese Burger - Sutter Home Family Vineyards

Ingredients

• 1 large white onion, halved and thinly sliced
• 1/4 cup Merlot
• 2 tablespoons butter
• 1/4 teaspoon salt
• 2 cups grated cheddar cheese
• 1/2 cup cream cheese
• 2 teaspoons dijon mustard
• 1 clove garlic (minced)
• 2 pounds ground beef (80% lean)
• 1 tablespoon worcestershire sauce
• 1 1/2 teaspoons salt
• 1 teaspoon cracked black pepper
• Vegetable oil, for brushing on the grill rack
• 6 4 1/2 inch Kaiser rolls, split