French Onion Burger aka The Croque Mister Burger - Sutter Home Family Vineyards

Ingredients

• 1 large sweet onion
• 1 quarter cup Sutter Home Cabernet Sauvignon
• 1 tablespoon Worcestershire sauce
• 1 rounded tablespoon Dark Brown Sugar
• 1 quarter cup Dijon Mustard
• 1 quarter cup Mayonnaise
• 1 teaspoon Sutter Home Chardonnay
• 1 and a half pounds Ground Chuck
• 1 and a half teaspoons Kosher Salt
• 1 teaspoon freshly ground black pepper
• 1-teaspoon garlic powder
• 1-teaspoon nutmeg
• 4 tbsp fresh chopped parsley (reserve 2 tbsp for garnish)
• 1 teaspoon Dijon mustard
• 1 half cup butter, softened
• 2 Large Baguettes, cut into thirds (ends trimmed)
• Canola oil, for brushing on the grill rack
• 1 and a half cups Gruyere Cheese (shredded)