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Alternative Cooking Method: If you don’t have a grill, the steak can be seared in a cast-iron skillet over medium-high heat for 4-5 minutes per side, then rested for juiciness. Add a Sauce: Try serving with a chimichurri, balsamic glaze, or a yogurt-based garlic sauce for extra flavor. Leftovers: Store in an airtight container in the refrigerator for up to 5 days. Reheat in the oven at 350°F for 10-12 minutes or in a skillet over medium heat. Protein content: A 4-ounce flank steak has around 25 g of protein, while a 6-ounce steak has at least 35 grams of protein.