01 -
In a medium bowl, blend mayonnaise, minced garlic, lemon juice, and salt until smooth. Chill to develop flavor if desired.
02 -
Combine skirt steak with brown sugar, balsamic vinegar, vegetable oil, kosher salt, and black pepper in a large bowl. Toss thoroughly and let sit while prepping onions.
03 -
Melt butter in a cast-iron skillet over medium heat. Add sliced onions and cook, stirring often, for 10–12 minutes until deep golden and sweet. Remove and set aside.
04 -
Increase skillet to high heat. Remove excess marinade from steak. Sear steak 3–4 minutes per side, aiming for a well-browned crust.
05 -
Transfer steak to a board, rest for 5 minutes, then slice thinly against the grain for best tenderness.
06 -
Brush roll interiors with melted butter. Place cut side down on a hot griddle or frying pan. Toast 2–3 minutes until crisp and golden.
07 -
Spread garlic aioli on toasted rolls. Layer Provolone cheese, arugula, sliced steak, and caramelized onions. Press gently to hold fillings and serve immediately.