1Place a piece of puff pastry inside a ramekin or small bowl.
2Layer a burger patty, a slice of cheddar cheese, burger sauce, caramelized onions, and pickles inside the pastry-lined ramekin.
3Place another burger patty on top, fold the edges of the puff pastry over to seal the burger inside, and invert the bowl to remove the sealed pastry-wrapped burger.
4Place the wrapped burgers on a baking tray, brush the tops with egg wash, and sprinkle with sesame seeds.