The French Onion Soup Veal Burger

Ingredients

• 3 tbsp (45 mL) butter
• 1 sprig fresh thyme
• 2 large Spanish onions, thinly sliced
• ½ cup (120 mL) dry white wine
• 1/2 cup (120 mL) veal or chicken stock
• Salt
• pepper
• 2.2 lbs (1 kg) ground Ontario veal
• 1 egg
• 1/4 cup (60 mL) dry white wine
• 2 tbsp (30 mL) Worcestershire sauce
• 1 tbsp (15 mL) garlic powder
• 1 tbsp (15 mL) onion powder
• 1/2 cup (120 mL) breadcrumbs
• 1 tsp (5 mL) salt
• 2 tsp (10 mL) ground pepper
• 1/2 cup (120 mL) Gruyere cheese grated
• 6 slices of Gruyere cheese
• 6 brioche buns