I love that this burger is like French onion soup in burger form. It's ooey, gooey, and so loaded with onion and beefy flavor.
Caramelizing the onions is the longest component of this recipe, but patience is key to the soft consistency and sweet flavor.
The onions can also be caramelized in the oven in a casserole dish covered with tin foil. Just heat the oven to 375 F.
To properly mimic a French onion soup, Maroney recommends using Gruyère, but says that a basic Swiss or lacey Swiss cheese could be substituted too.
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