01 -
Place thick onion slices in ice water and soak for several hours to enhance batter adhesion and ensure crispness.
02 -
Whisk together flour, cornstarch, salt, pepper, garlic powder, and cayenne in a bowl. Gradually add beer, whisking until the batter is thick and smooth, resembling pancake batter consistency.
03 -
Pat onion rings dry, dust lightly with flour, then dip each ring fully into the beer batter, ensuring even coating.
04 -
Heat vegetable oil in a deep cast iron skillet to 190°C (375°F). Fry onion rings in small batches until golden and crisp, about 2–3 minutes per side. Drain on paper towels.
05 -
Fry bacon in the cast iron skillet over medium heat until fat is rendered and edges are crisp. Transfer to paper towels to drain excess fat.
06 -
Divide ground beef into 2-ounce balls and refrigerate briefly. Smash each ball onto a hot skillet, season liberally with salt and pepper, and cook until a caramelized crust forms, about 3 minutes per side. Add cheese slices on top during last minute to melt.
07 -
Stack cheeseburger patties to create a double layer. Remove from heat and let rest briefly.
08 -
Toast brioche buns until golden. Spread mayonnaise on the bottom bun, then layer with double cheeseburger patties, crispy bacon, beer battered onion rings, a drizzle of barbecue sauce, and finish with the top bun. Press gently and serve immediately with additional onion rings on the side.