This steak fajita recipe uses bottled Italian salad dressing as part of the steak marinade. For a healthy choice, pick a dressing with a short and simple ingredient list including canola or olive oil. Tasty Tips Before cooking, cut the steak with the grain into several portions to make the long piece more manageable on the grill or in a skillet. Once cooked, be sure to slice it across the grain for maximum tenderness. Hanger steak, flat-iron, and flank steak can all be used as substitutes for skirt steak in most recipes. New Mexico chiles (aka Anaheim chiles) are 7 to 10 inches long, ripen from green to red, and are mildly spicy. Poblano peppers are dark green in color and about 6 inches long, and can be fiery or relatively mild: There’s no way to tell until you taste them. The two can be used interchangeably. Serve these steak …