Stuffed Onion Soup Burgers

Ingredients

• 2 tbsp. butter
• 1 large onion, thinly sliced
• kosher salt
• Freshly ground black pepper
• 1 tbsp. fresh thyme leaves
• 2 tbsp. dry white wine
• 1 lb. ground beef
• 1 packet French onion soup mix (such as Lipton's)
• 1 tbsp. Worcestershire sauce
• 2 cloves garlic, minced
• 1 large egg
• 2 c. shredded Gruyère
• 1 tbsp. extra-virgin olive oil
• 4 Hamburger buns
• 4 pieces lettuce
• 4 slices tomato

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