INSTRUCTIONS
1
Caramelize onions: cook in butter over medium-low heat for 20–30 min until deeply golden. Set aside.
2
Whisk together all secret sauce ingredients. Refrigerate.
3
Form beef into 4 thin patties. Season with salt and pepper.
4
Cook in a cast-iron skillet over medium-high, smashing down for the first 30 seconds. 2–3 min per side. Add cheese in the last minute.
5
Build your bowl: lettuce base, burger patty, secret sauce, caramelized onions, tomato, white onion, and pickles.