Sautee Yellow Onion over low heat for at least 15 minutes, stirring occasionally. Continue sauteeing until onions become caramelized and appear semi-translucent. Set aside.
Cook Burger to order (4-5 minutes per side on high heat for Medium Rare).
Build Your Burger: Bottom Bun, Burger, Caramelized Onions, Pub Cheese, Top Bun. Enjoy!