Ingredients
Serves 2
1 lb (454 g) ground chuck (80/20 fat ratio—essential for juiciness)
4 slices marble rye bread (sturdy, seeded, and slightly tangy—avoid thin-sliced)
4 slices (2 oz / 60 g) Swiss cheese, thinly sliced (Emmental or Jarlsberg for superior melt)
1 medium yellow onion, thinly sliced (¼-inch thick—uniformity matters)
3 Tbsp unsalted butter, divided
1 Tbsp neutral oil (avocado or canola—high smoke point)
½ tsp fine sea salt
½ tsp freshly ground black pepper
½ tsp garlic powder
1 tsp Worcestershire sauce (Lea & Perrins—adds umami depth)
Pro Upgrade
→ 1 tsp Dijon mustard (spread on bread before assembling)
→ 2 Tbsp beef broth (added to onions for extra richness)
→ Pinch of smoked paprika (in patty seasoning)
Step-by-Step Instructions
1. Caramelize with Patience
Heat oil + 1 Tbsp butter in a 12-inch skillet over medium-low.
Add onions + pinch of salt; cook 8–10 minutes—stirring every 2–3 minutes—until deep golden, sweet, and jammy. Do not rush.
Optional: Deglaze with 2 Tbsp beef broth; simmer 1 min. Transfer to bowl; wipe skillet.
2. Form the Patties
Divide beef into 2 equal portions. Gently shape into thin ovals (½-inch thick, slightly larger than bread—shrinkage happens). Do not overwork.
Season both sides with salt, pepper, garlic powder, and Worcestershire. Press gently to adhere.
3. Sear the Burgers
Heat skillet over medium-high. Add patties; cook 2–3 minutes per side—until deeply browned and 160°F internal. No pressing!
Transfer to plate; tent loosely with foil.
4. Assemble for Maximum Melt
Butter one side of each bread slice.
On unbuttered side of 2 slices, layer in this order:
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