Piled high with steak and veggies, the real treat on this sandwich is the sauce, a pesto mayonnaise. Use sirloin for a more tender bite than you get with cuts like flank steak. Ingredients 1 (12-ounce) boneless beef sirloin steak (about 1 inch thick), trimmed 1/4 teaspoon kosher salt 1/8 teaspoon freshly ground black pepper […]
