01 -
In a medium bowl, combine mayonnaise, minced garlic, lemon juice, and salt. Stir until well incorporated and set aside.
02 -
In a large bowl, toss skirt steak with brown sugar, balsamic vinegar, vegetable oil, kosher salt, and black pepper until evenly coated.
03 -
Melt butter in a cast-iron skillet over medium heat. Add sliced onions and cook, stirring frequently, for 10–12 minutes until caramelized. Transfer onions to a plate.
04 -
Increase skillet to high heat. Let marinade drip off the steak, then add steak to the pan. Sear for 3–4 minutes per side until cooked to preferred doneness.
05 -
Remove steak from heat and rest for 5 minutes. Thinly slice steak against the grain.
06 -
Brush hoagie rolls with melted butter. Place buttered side down on a hot griddle or pan and toast for 2–3 minutes until golden.
07 -
Spread garlic aioli onto toasted rolls. Layer with Provolone cheese, arugula, sliced steak, and caramelized onions. Serve immediately.