 out with the plastic wrap. Put the patties on a large dish or small baking sheet and refrigerate until ready to cook."},{"@type":"HowToStep","text":"Melt 2 cups of the butter in a pot over medium heat. (Why yes, that is a lot of butter, but it\u2019s used to fully submerge the onion while it cooks; you will not eat\u00a02 cups of butter in this burger.) Add the onion, turn the heat to low, and gently cook at a bare simmer until the onion is tender, about 20 minutes. The onion should be cooked but still al 