Season both sides of a flank steak generously, then sear it over high heat for 3 to 5 minutes per side until a deep brown crust forms. Lean cuts like flank have almost no intramuscular fat, so quick high-heat cooking and proper slicing matter more than time on the heat.
Below you’ll find how to identify flank, build a quick marinade, pick between grill, cast iron, broiler, and sous vide, and slice the finished steak so each bite stays tender.
Flank Steak Is Lean, Flat, and Demands a Different Approach
A flank steak comes from the abdominal wall, just behind the brisket and below the loin, where the muscles work hard and stay unusually flat. That hard work shows up on the plate: the cut is broad, thin, and famously lean, usually 1.5 to 2.5 pounds, with long muscle fibers running the full length of the steak and almost no marbling to soften them.
Because those fibers run so cleanly in one direction, the cut behaves less like a ribeye and more like a long, muscular strap. Treat it like a fatty steak and you’ll get a dry, chewy result. Treat it as a fast-cooking, slice-thin, marinate-first protein and the same cut becomes tender enough for fajitas, salads, and sandwiches.
How Flank Compares to Skirt and Hanger
| Cut | Shape and Weight | Typical Serving | Flavor and Texture Notes |
|---|---|---|---|
| Flank steak | Broad, flat, 1.5 to 2.5 lb | 4 to 6 people | Lean, beefy, long fibers that need slicing across the grain |
| Skirt steak | Long, thin strip, 1 to 1.5 lb | 3 to 4 people | More open-grained, richer flavor, slightly looser texture |
| Hanger steak | Thick, irregular shape, 1 to 2 lb | 3 to 4 people | Central spine cut with looser fibers and a more mineral, iron-rich flavor |
Skirt and hanger can substitute for flank in a pinch, but they cook in slightly less time and shred differently when sliced. Both Serious Eats and America’s Test Kitchen treat flank as a separate, more forgiving cut for family-style cooking.
Why Lean Muscle Rewards a Different Strategy
Marbling carries flavor and self-bastes a steak as it cooks. Flank has very little of it, so the muscle relies on external moisture, acid, and salt to stay juicy. Acid-based marinades, dry-brining with salt, and quick high-heat searing all serve the same purpose: protect tenderness before the cut has a chance to dry out.
Seasonings and Marinades That Build Flavor Before the Heat Goes On
Dry seasoning alone gives a clean, beefy result, but a short marinade does three things at once. It seasons the meat past the surface, the acid begins to soften the long fibers, and the oil carries fat-soluble flavor into the muscle. Aim for a 30-minute minimum and an 8-hour ceiling so the surface does not turn mushy.
A Simple, Reliable Marinade Base
- Garlic, 3 to 4 cloves: crush or finely grate it so the oils release quickly into the marinade.
- Soy sauce, 1/4 cup: adds salt and umami that penetrates deeper than table salt alone.
- Lime juice, 2 tablespoons: brings bright acid that loosens surface fibers.
- Olive oil, 2 tablespoons: carries flavor and helps the marinade cling during searing.
- Cracked black pepper, 1 teaspoon: coarse grind stands up to high heat without burning.
Combine those in a zip-top bag, add the steak, press out the air, and refrigerate. Reserve 1 to 2 tablespoons of the marinade before the raw meat goes in if you plan to baste or drizzle it on at the end.
Marinating Time and Smart Shortcuts
Tip: 2 to 8 hours is the tenderizing sweet spot. Past 12 hours, the lime juice can turn the outer layer mushy and the salt can start to cure the meat like a brine.
Dry-brine with 1 teaspoon of kosher salt per pound for 40 minutes at room temperature, then pat the surface dry before cooking. Scoring the steak in a shallow crosshatch on both sides also helps marinades penetrate and gives you a slightly more even sear when you only have 30 minutes to work with.
That penetration only pays off once the cooking method matches the prep you’ve already done.
Choose Grilling, Broiling, Pan-Searing, or Sous Vide Based on Your Setup
All four methods work, and the right one depends on whether you have a backyard grill, a cast iron skillet, a broiler, or a sous vide setup. The shared goal is the same: a fast, high-heat sear that builds a deep brown crust without overshooting your target temperature inside.
| Method | Best For | Approximate Time Per Side | Crust Quality |
|---|---|---|---|
| Grill | Outdoor cooking, smoky char | 3 to 5 minutes | Strong grill marks, lighter smoke flavor |
| Cast iron pan | Indoor searing, weeknight cooking | 3 to 4 minutes | Deep, even browning across the surface |
| Broiler | No grill or heavy pan available | 4 to 5 minutes | Crisp, charred edges; watch closely for flare-ups |
| Sous vide then sear | Precise internal temperature | 1 to 2 hours in bath, 1 minute sear | Uniform doneness with a final crust |
Grilling Over Direct High Heat
Heat a gas or charcoal grill to about 450 to 500°F. Lay the steak over the hottest part of the grate at a 45-degree angle to get crosshatch marks, close the lid, and flip once after 3 to 5 minutes. A Weber gas grill hits this range quickly with all burners on high; a charcoal kettle needs the vents wide open and the coals fully ashed over.
Pan-Searing in a Screaming-Hot Cast Iron Skillet
Heat a 12-inch cast iron skillet for 3 to 4 minutes on high until a drop of water skitters across the surface. Add a thin film of high-smoke-point oil, lay the steak away from you, and resist the urge to move it for 3 to 4 minutes. Flip once, sear the second side for 2 to 3 minutes, then check temperature.
Broiling Close to the Element
Set the broiler on high with the rack 4 to 5 inches from the element. Broil 4 to 5 minutes per side on a foil-lined sheet tray, leaving the oven door cracked so the broiler cycles correctly. This is the closest indoor substitute for grill flavor and works well for thin flank cuts around 1 inch thick.
Sous Vide to a Target Temperature, Then a Fast Sear
Set the water bath to 130°F for medium-rare, drop the sealed steak in for 1 to 2 hours, then pat it completely dry and sear in a hot pan or torch for 60 to 90 seconds per side. The sear step matters more than usual because sous vide produces a pale, gray surface that needs a real Maillard reaction to taste like a grilled steak.
Cook to 130 to 135°F for Medium-Rare and Pull Off the Heat Early
Flank stays tender in a narrow window. Medium-rare to medium, roughly 130 to 135°F internal, is where the muscle fibers still feel juicy instead of tight. The USDA recommends 145°F for whole-muscle beef, which gives a slightly firmer result; many cooks trade that small margin of pink for the texture difference.
Thermometer Placement and Carryover Cooking
Insert an instant-read thermometer like a ThermoPro or Thermapen into the thickest part of the steak from the side, away from any surface. Pull the steak at 125 to 128°F if you plan to tent it loosely, because the internal temperature climbs 5 to 8°F during carryover as the muscle rests. Skip the thermometer and you will overshoot the target almost every time.
Tip: 3 to 5 minutes per side is the right window for a 1 to 1.5-inch flank steak over high heat. Go past 6 minutes per side and the lean muscle tightens past the point of tenderness.
USDA Safety Note and the Pink Trade-Off
Whole-muscle cuts like flank are considered safer than ground beef because bacteria stay on the surface, which the high-heat sear kills. The 145°F USDA guideline exists for the conservative case. Cooking to 130 to 135°F keeps the texture advantage; cooking to 145°F adds a small safety margin for pregnant guests, older diners, or anyone who prefers peace of mind over a pinker center.
Rest the Meat and Slice Against the Grain at a Slight Angle
Two small steps decide whether the final plate feels juicy or dry. Resting lets the proteins relax and reabsorb the juices that move outward during cooking. Slicing across the grain shortens the long fibers so each bite feels tender instead of chewy.
How to Rest a Flank Steak
Transfer the cooked steak to a warm plate or a cutting board with a groove to catch drips. Tent loosely with foil for 5 to 10 minutes; tight foil traps steam and softens the crust you just built. Slice after the rest, not before, because cutting early sends the pooled juices straight onto the board.
Reading the Grain and Slicing Thin at a Slight Angle
Look at the raw side of the steak and you’ll see long parallel lines running end to end. Rotate the steak 90 degrees so those lines run left to right in front of your knife. Slice about 1/4 inch thick on a slight diagonal, which increases the surface area of each piece and shortens the fibers even further. A Chef’sChoice 15-inch slicer or any long, sharp blade keeps the cuts even.
Avoid the Five Mistakes That Turn Flank Steak Into a Chew Toy
Flank is forgiving compared to skirt, but a few habits will reliably ruin it. Skipping any of them costs you most of the texture the cut is famous for.
Even careful cooks slip up, and once texture is lost, no sauce can fully rescue it.
- Skipping the rest: cutting immediately dumps the juices onto the board and leaves dry meat behind.
- Slicing with the grain: lines up the long fibers in every bite, doubling the perceived chew.
- Cooking past medium: past 145°F internal, the lean muscle squeezes out what little moisture it has.
- Under-marinating or skipping acid: leaves the surface fibers intact, so even a perfect sear sits on top of a tough steak.
- Treating skirt or hanger as a 1:1 swap: they are thinner and cook faster, so substituting without adjusting time leads to overcooked edges and a raw center.
Warning: buying the wrong substitute is the most expensive of these mistakes. Skirt steak looks similar but is half the thickness; hanger steak has a central membrane that needs trimming. Adjust cook time and double-check the cut before it hits the heat.
Quick Dinner Ideas and Leftover Uses for a Cooked Flank Steak
Once you’ve nailed the sear and the slice, the same steak turns into a week of meals. A single 2-pound flank feeds four at dinner and still leaves enough for next-day lunches when sliced thin.
Same-Night Plates
- Tacos or fajitas: warm corn tortillas, quick-pickled onions, salsa verde, and sliced steak with a spoonful of chimichurri.
- Steak salad: arugula, cherry tomatoes, shaved parmesan, balsamic, and rare slices laid across the top.
- Rice bowl: jasmine rice, avocado, charred corn, black beans, and steak strips with a chipotle-lime drizzle.
Next-Day Sandwiches and Wraps
Leftover flank reheats best from cold or barely warmed, since full microwave cycles toughen it. Layer thin slices into a baguette with horseradish cream, tuck them into a wrap with hummus and cucumber, or spoon them over flatbread with tzatziki and pickled red onion.
Storing Sliced Steak for the Next Day
Refrigerate sliced steak in a shallow container with a thin layer of pan juices or beef broth on top to keep the surface moist. Use it within 3 days for best texture, or freeze the slices flat in a zip-top bag with the air pressed out for up to 2 months. Thaw in the refrigerator overnight and add the slices cold to a warm dish so they reheat gently without overcooking.
Bottom Line
A great flank steak comes down to four habits: marinate for at least 30 minutes, sear over high heat for 3 to 5 minutes per side, pull the steak at 130 to 135°F, and slice thinly across the grain after a 5 to 10 minute rest. Master those four moves and the same cut works for tacos on Tuesday and sandwiches on Friday without ever turning into a chew toy.
FAQ
How long should you cook flank steak?
Sear flank steak over direct high heat for 3 to 5 minutes per side, pulling it off once an instant-read thermometer hits 130 to 135°F in the thickest part. Thinner cuts closer to 3/4 inch finish in about 2 to 3 minutes per side.
What temperature should flank steak be cooked to?
Target 130 to 135°F for medium-rare, which keeps the lean muscle tender. The USDA recommends 145°F for whole-muscle beef, which gives a slightly firmer result with a small safety margin.
Do you need to marinate flank steak?
Marinating is not required, but 30 minutes to 8 hours in an acid-based mixture softens the long fibers and seasons past the surface. Dry-brining with salt works as a faster alternative when time is short.
Should flank steak be cooked rare or well done?
Cook flank to medium-rare or medium for the best texture. Rare can feel too soft, and well done dries out the cut because there is almost no intramuscular fat to keep it moist.
How do you keep flank steak from being tough?
Marinate with acid, sear fast over high heat, pull at 130 to 135°F, rest for 5 to 10 minutes, and slice thinly across the grain on a slight angle. Skipping any of those steps is the most common reason flank turns chewy.
What’s the difference between flank steak and skirt steak?
Flank is wider, thicker, and slightly leaner with longer, more parallel fibers. Skirt is thinner, more open-grained, and cooks in about half the time, so it needs a faster sear and shorter rest.
