Big Steak Sandwich Piled High with Garlic Aioli and Sweet Caramelized Onions - ioanacooks

Ingredients

• 120 ml mayonnaise
• 1 clove garlic, finely minced
• 5 ml lemon juice
• 0.25 teaspoon salt
• 680 g skirt steak
• 24 g brown sugar
• 30 ml balsamic vinegar
• 15 ml vegetable oil
• 0.5 teaspoon kosher salt
• 0.13 teaspoon coarse ground black pepper
• 42 g unsalted butter
• 2 large onions, thinly sliced
• 4 hoagie rolls
• 30 g arugula
• 8 slices Provolone cheese