preperationIn a saute pan caramelize your onions by cooking them on medium high heat for about 20 minutes in olive oil or until they are golden brown. Deglaze the pan with chicken stock and cook the liquid completely out. Salt and pepper to taste. Reserve
In a bowl place the meat and add in the egg, white wine, worcestershire sauce, garlic and onion powder, bread crumbs, salt, pepper, thyme and grated Gruyere cheese. Combine until all the ingredients are mixed well into the meat. Divide the meat into 6 parts and form your burgers. Using your fingers create a well in the centre of the burger so the middle is thinner than the edges for more even cooking.
Cook the burgers about 4 to 5 minutes per side. When you flip them place the sliced Gruyere cheese on top and let it melt while the burger cooks through.
Build your burger by layering the bun, meat, caramelized onions and then the burger top!