Costco is known for providing a wide range of high-quality meats, and their flank steak is no exception. This versatile cut of meat is perfect for grilling, broiling, or pan-searing. In this tutorial, we will guide you through the process of cooking Costco flank steak to perfection.

Choose the Right Cut

When it comes to cooking flank steak, selecting the right cut is crucial. Look for a cut that has a uniform thickness throughout and is evenly marbled with fat. This will ensure that your steak cooks evenly and stays juicy.

Prepare Your Steak

Before you start cooking your steak, make sure to let it come to room temperature. Take the steak out of the refrigerator at least 30 minutes before cooking to ensure that it cooks evenly.

Next, season your steak with your favorite rub or marinade. Flank steak has a bold flavor on its own, so you can keep it simple with just salt and pepper. Rub the seasoning into the meat on both sides and let it sit for at least 15 minutes before cooking.

Cooking Method

The best way to cook Costco flank steak is on the grill or in a cast-iron skillet. Both methods are quick and easy, and they produce delicious results.

If using a grill, preheat your grill to medium-high heat (around 400°F). Place the steak directly on the grates and cook for 4-5 minutes per side for medium-rare doneness. Use tongs to flip the steak over only once during cooking.

If using a cast-iron skillet, heat some oil over medium-high heat until hot but not smoking. Add your seasoned flank steak to the pan and cook for 4-5 minutes per side for medium-rare doneness.

Resting Your Steak

Once your flank steak is cooked to your desired doneness, remove it from the heat source and let it rest for at least 5 minutes. This will allow the juices to redistribute throughout the meat and prevent them from running out when you cut into it.

Serving Suggestions

There are endless ways to enjoy your Costco flank steak. Slice it thinly against the grain and serve it on top of a salad or as a taco filling. You can also serve it with some grilled vegetables or roasted potatoes for a complete meal.


By following these simple steps, you can cook Costco flank steak to perfection every time. Remember to choose the right cut, season it well, and cook it using your preferred method. With a little bit of practice, you’ll be able to impress your family and friends with your delicious flank steak recipe.