Flank steak cooks best when you sear it quickly over high heat and let it rest before slicing it thinly. Learning how to cook a flank steak is a simple skill that turns a tough cut into a tender, flavorful meal. This guide covers everything from choosing the right steak to serving it perfectly.
You don’t need fancy equipment or hours of prep time. A hot pan, a good marinade, and a sharp knife are all you really need. Let’s get started.
What Is Flank Steak?
Flank steak comes from the lower belly of the cow. It’s a lean, long cut with pronounced grain lines. Because it gets a lot of exercise, it can be tough if cooked wrong.
But when you cook it right, it’s incredibly beefy and satisfying. It’s also more affordable than many other steaks.
Flank Steak Vs Skirt Steak
People often confuse flank steak with skirt steak. Skirt steak is from the plate section, has more fat, and is thinner. Flank steak is thicker, leaner, and has a tighter grain.
Both are great for quick cooking, but flank steak benefits more from marinating. Skirt steak is often better for fajitas because of its higher fat content.
Choosing The Right Flank Steak
Look for a steak that is deep red in color. Avoid any that look brown or grey. The steak should feel firm to the touch, not slimy.
Check the thickness. A good flank steak is about 1 to 1.5 inches thick. Thinner steaks cook too fast and dry out. Thicker ones are easier to cook to the right doneness.
Also, look for even thickness across the whole steak. This ensures it cooks uniformly. If one end is much thinner, it will overcook before the thick part is done.
How To Prepare Flank Steak
Preparation is key for this cut. You need to break down the tough fibers before cooking.
Trimming The Steak
Flank steak often has a thin layer of silver skin or excess fat on one side. Use a sharp knife to trim this off. Silver skin doesn’t render down and makes the steak chewy.
Don’t remove all the fat. A little fat adds flavor. Just remove the tough, white membrane.
Tenderizing The Meat
You can tenderize flank steak with a meat mallet. Place the steak between two pieces of plastic wrap. Pound it gently to an even thickness.
This breaks down some of the connective tissue. It also helps the marinade penetrate deeper. Be careful not to pound it too thin.
Marinating For Flavor And Tenderness
Marinating is not optional for flank steak. It adds flavor and helps tenderize the meat. An acidic marinade works best.
- Use an acid like lime juice, lemon juice, or vinegar.
- Add oil to help carry flavor and prevent sticking.
- Include aromatics like garlic, onion, and herbs.
- Season with salt, pepper, and spices.
Here is a simple marinade recipe:
- 1/4 cup soy sauce
- 2 tablespoons olive oil
- 2 tablespoons lime juice
- 3 cloves garlic, minced
- 1 teaspoon black pepper
Place the steak in a zip-top bag. Pour in the marinade. Remove as much air as possible. Refrigerate for at least 2 hours, but no more than 8 hours.
Marinating too long can make the meat mushy. The acid breaks down the proteins, but overdoing it ruins the texture.
How To Cook A Flank Steak: Step-By-Step
Now we get to the main event. Follow these steps for a perfect flank steak every time.
Step 1: Bring The Steak To Room Temperature
Take the steak out of the fridge 30 minutes before cooking. This allows it to warm up slightly. A cold steak cooks unevenly.
Pat it dry with paper towels. Excess moisture on the surface prevents a good sear. Dry meat equals a better crust.
Step 2: Preheat Your Pan Or Grill
You need high heat for flank steak. Use a cast iron skillet, a heavy stainless steel pan, or an outdoor grill. Heat it over medium-high to high heat for at least 5 minutes.
The pan should be smoking hot before you add the steak. This gives you that deep brown crust.
Step 3: Season The Steak
If you marinated the steak, shake off excess marinade. Pat it dry again. Then season generously with salt and pepper.
If you didn’t marinate, season both sides with salt, pepper, and any other spices you like. Don’t be shy with the salt.
Step 4: Sear The Steak
Add a little oil to the hot pan. Swirl to coat the bottom. Carefully place the steak in the pan. It should sizzle loudly.
Cook for 4 to 5 minutes on the first side. Do not move the steak. Let it develop a dark crust.
Flip the steak using tongs. Cook for another 3 to 4 minutes on the second side. The internal temperature should be about 130°F to 135°F for medium-rare.
Step 5: Check Doneness
Use an instant-read thermometer for accuracy. Insert it into the thickest part of the steak.
- Rare: 120°F to 125°F
- Medium-Rare: 130°F to 135°F
- Medium: 140°F to 145°F
- Medium-Well: 150°F to 155°F
- Well Done: 160°F and above
Flank steak is best at medium-rare to medium. Anything beyond medium-well becomes tough and dry.
Step 6: Rest The Steak
This step is critical. Transfer the steak to a cutting board. Tent it loosely with foil. Let it rest for 5 to 10 minutes.
Resting allows the juices to redistribute throughout the meat. If you cut it immediately, all the juice runs out onto the board.
Step 7: Slice Against The Grain
Flank steak has long, visible grain lines. You must slice perpendicular to these lines. This shortens the muscle fibers and makes the meat tender.
Slice the steak into thin strips, about 1/4 inch thick. Angle your knife slightly for wider, more elegant slices.
If you slice with the grain, the meat will be chewy and stringy. This is the most common mistake people make.
Different Cooking Methods For Flank Steak
Pan-searing is the most common method, but you have other options.
Grilling Flank Steak
Grilling adds a smoky flavor. Preheat your grill to high heat. Clean and oil the grates. Grill the steak for 4 to 5 minutes per side.
Use direct heat for a good sear. Avoid moving the steak too much. Let it rest and slice as usual.
Broiling Flank Steak
Broiling is great for indoor cooking. Place the steak on a broiler pan. Set the oven rack about 4 inches from the heating element.
Broil for 4 to 5 minutes per side. Watch it closely, as broilers can burn food quickly. Rest and slice.
Sous Vide Flank Steak
Sous vide gives you perfect doneness every time. Season the steak and seal it in a bag. Cook in a water bath at 130°F for 2 to 4 hours.
After sous vide, pat the steak dry. Sear it in a hot pan for 1 minute per side. This gives you a crust without overcooking the interior.
Common Mistakes To Avoid
Even experienced cooks make errors with flank steak. Here are the biggest ones to avoid.
- Not resting the steak. This is the number one mistake. Resting is non-negotiable.
- Slicing with the grain. Always slice against the grain for tenderness.
- Overcooking. Flank steak dries out fast. Cook to medium-rare or medium.
- Skipping the marinade. A good marinade adds flavor and tenderness.
- Using low heat. High heat is essential for a good sear.
How To Serve Flank Steak
Flank steak is versatile. Here are some serving ideas.
- Slice it and serve over a salad.
- Use it in fajitas or tacos.
- Serve with roasted vegetables and potatoes.
- Add it to stir-fries.
- Make a steak sandwich with crusty bread.
The leftovers are great cold. Slice them thin and add to wraps or sandwiches.
Storing And Reheating Leftovers
Store leftover flank steak in an airtight container in the fridge. It will keep for 3 to 4 days.
To reheat, slice the steak first. Then quickly sear the slices in a hot pan for 30 seconds per side. This revives the crust without drying out the meat.
You can also reheat it in a microwave, but it won’t be as good. The microwave makes the meat rubbery.
Frequently Asked Questions
Can I Cook Flank Steak Without A Marinade?
Yes, but it won’t be as tender. If you skip the marinade, season it well and cook it quickly to medium-rare. Slicing against the grain becomes even more important.
How Long Should I Marinate Flank Steak?
At least 2 hours, but no more than 8 hours. Longer than 8 hours can make the meat mushy. The acid in the marinade breaks down proteins too much.
What Is The Best Temperature To Cook Flank Steak?
Medium-rare, around 130°F to 135°F. This gives you a tender, juicy steak. Cooking it past medium makes it tough.
Can I Freeze Flank Steak?
Yes, you can freeze raw flank steak for up to 3 months. Thaw it in the fridge overnight before cooking. You can also freeze cooked flank steak for up to 2 months.
Why Is My Flank Steak Tough?
It is likely overcooked or sliced with the grain. Flank steak is naturally lean, so it dries out fast. Always cook to medium-rare and slice against the grain.
Final Tips For Perfect Flank Steak
Here are a few more things to keep in mind.
- Use a sharp knife for slicing. A dull knife tears the meat.
- Let the steak rest on a warm surface, not a cold one.
- If you like a stronger flavor, add a dry rub before cooking.
- Don’t crowd the pan. Cook one steak at a time if needed.
Flank steak is a rewarding cut to cook. It takes a little attention, but the result is a delicious, beefy meal that won’t break the bank. Practice these steps, and you’ll get consistent results every time.
Remember, the key points are high heat, proper rest, and slicing against the grain. Master these, and you’ll never have a tough flank steak again.
Now you know exactly how to cook a flank steak. Grab one from the store, fire up your pan, and enjoy a great dinner tonight.