SASSY PEAR-ADISE CHEESEBURGERS with CABERNET ONIONS, BRIE, PROSCIUTTO and HONEY MUSTARD-CAYENNE MAYO

Ingredients

• 1 C. Mayonnaise
• 2 T. Grey Poupon Honey Dijon Mustard
• 1/2 t. Ground Cayenne Pepper
• 1 C. Colavita Extra Virgin Olive Oil, divided
• 1 Large Onion, thinly sliced (about 2 1/4 C.)
• 3 T. + 1/2 C. Sutter Home Cabernet Sauvignon Wine, divided
• 2 lb. Ground Beef Round
• 2 1/2 t. Herbes de Provence, divided
• 2 1/2 t. Kosher Salt, divided
• 1/2 t. Fresh Coarsely Ground Black Pepper
• 1 T. + 2 t. Grey Poupon Spicy Brown Mustard, divided
• 1 Clove Garlic, crushed
• Vegetable Oil for Brushing Grill Rack
• 2 Firm Ripe Pears, halved, stems removed and cored
• 8 oz. Brie, rind removed, cut into 6 equal slices
• 6 Ciabatta Rolls, split
• 6 Thin Slices Prosciutto