French Onion Soup Burger with Gruyere and Arugula

Ingredients: 3 tablespoons butter 5 onions, 4 thinly sliced and 1 peeled 1 bay leaf Sea salt and pepper 1/2 teaspoon ground thyme 1 cup beef consomme 1 1/2 cups sour cream 2 pounds ground chicken 1/2 pound of Gruyere Cheese Fresh Arugula About 1/4 cup worcestershire sauce (eyeball it) A handful ...