Caramelized Onion Burger

Ingredients

• 24 ounces yellow onions – halved and thinly sliced
• 1 tablespoon neutral oil
• 2 tablespoons unsalted butter
• 1.5 teaspoons kosher salt
• 0.75 teaspoons black pepper
• 0.25 cup water
• 1.25 pounds ground beef (80/20)
• 4 each hamburger buns
• 4 slices sliced cheddar cheese

Instructions

1. Combine 1.5 tsp kosher salt and 0.75 tsp black pepper in a small bowl and set aside as a seasoning mixture.
2. Halve and thinly slice the yellow onions.
3. Heat the neutral oil and 1 tbsp unsalted butter in a large heavy skillet over medium-low heat. Add the sliced onions and a pinch of the seasoning mixture. Cook, stirring every few minutes, until deep golden and jammy, 25–35 minutes; add splashes of the water as needed (2–4 tbsp at a time) to dissolve browned bits. Transfer to a bowl and keep warm.
4. Divide the ground beef (80/20) into 4 equal portions and gently form 3/4-inch-thick patties with a slight dimple in the center of each.
5. Return the skillet to medium-high heat. Season patties all over with most of the remaining seasoning mixture just before they go in. Sear until well browned on the first side, 3–4 minutes; flip, top each with 1 slice of the sliced cheddar cheese (if using), and cook 2–4 minutes more to 125–130°F for medium-rare or up to 160°F for well done.
6. Reduce heat to medium, melt the remaining 1 tbsp in the skillet, and place the split hamburger buns cut side down to toast until golden, 1–2 minutes.
7. Set bun bottoms on plates, spoon some onions on each, add patties, top with more onions, cap with bun tops, rest 2 minutes, and serve hot.