01 -
Preheat a skillet to medium heat (350°F). Add 2-3 tablespoons of neutral oil, diced onions, and 2/3 stick of unsalted butter. Stir until butter is melted. Season with 1 tablespoon kosher salt and stir every 5 minutes until onions turn into a paste, about 45 minutes.
02 -
Remove excess oil/fat with a paper towel, increase heat to 400°F, and stir continuously until onions turn golden brown.
03 -
Slice jalapeños into small rings. In a separate skillet with a bit of oil over medium heat, sauté the jalapeños until softened and slightly charred. Set aside.
04 -
Mix mayo, ketchup, mustard, sweet relish, chopped chipotle pepper, adobo, white wine vinegar, and kosher salt in a bowl. Refrigerate.
05 -
Form 1/4-pound patties from the ground Chuck, shape to fit Texas toast buns, and season with beef rub. Refrigerate on parchment paper for 15-20 minutes.
06 -
Heat a griddle to 375°F and cook about 1/2 pound of bacon. Keep warm in aluminum foil.
07 -
Grill refrigerated patties on the griddle for 4 minutes, season with beef rub, squeeze mustard on top, flip, and grill for another 3 minutes. Add 2 slices of Colby jack cheese to each patty to melt.
08 -
Spread spicy burger mixture on Texas toast buns and toast on the griddle for about 60 seconds per side.
09 -
Lay down a slice of Texas toast, spread with the spicy burger mixture, add sautéed jalapeño rings, place two beef patties, top with caramelized onions, and cap with another slice of Texas toast.