While the marinated flank steak delivers bold, savory flavor, it’s the toppings that truly make this sandwich shine. Tangy blue cheese pairs beautifully with the beef, while peppery arugula, sweet onions, and juicy tomatoes add freshness, texture, and the perfect balance of flavors. 2 large sweet onions 4 tablespoons olive oil, divided 1/2 teaspoon salt… Continue reading