Grilling flank steak to medium-rare requires a hot fire and a watchful eye. If you’ve ever wondered how to cook flank steak grill style without ending up with a tough, chewy piece of meat, you’re in the right place. This cut is lean, flavorful, and perfect for quick grilling—but it demands technique. Let’s get straight to it.
Flank steak comes from the belly of the cow. It’s a long, flat muscle that gets a lot of work. That means it can be tough if you cook it wrong. But with the right heat and timing, it turns into a tender, juicy steak with a beefy punch.
You don’t need fancy equipment. A standard gas or charcoal grill works fine. What matters most is temperature control and resting time. We’ll cover every step so you can serve a perfect flank steak every time.
Why Flank Steak Is Ideal For Grilling
Flank steak is a favorite for grilling because it cooks fast. It’s thin, so it only needs a few minutes per side. The high heat sears the outside while keeping the inside pink and tender.
It’s also affordable compared to ribeye or filet mignon. You get big flavor without spending a lot. Plus, it’s great for slicing against the grain, which makes each bite easy to chew.
One thing to remember: flank steak is not the same as skirt steak. Skirt is thinner and has more fat. Flank is leaner and wider. Both are good, but they cook differently.
How To Cook Flank Steak Grill: The Complete Method
Here is the exact process to follow. From prep to plating, these steps will give you a steak that’s charred on the outside and tender inside.
Step 1: Choose The Right Flank Steak
Look for a flank steak that’s about 1 to 1.5 inches thick. Thinner cuts dry out too fast. Thicker ones may burn on the outside before the inside is done.
Check the color. You want bright red meat with minimal browning. Avoid any steak that looks gray or has a slimy feel. Freshness matters.
If you can, buy from a butcher. Pre-packaged flank steak often has added brine or solution, which can affect flavor and texture.
Step 2: Season Generously
Flank steak has a strong beef flavor, but it needs salt. Use kosher salt or sea salt. Apply it at least 30 minutes before grilling. This draws out moisture, then reabsorbs it, seasoning the meat deep inside.
You can add black pepper, garlic powder, or smoked paprika. Keep it simple. The goal is to enhance the beef, not mask it.
For a marinade, try olive oil, soy sauce, lime juice, and minced garlic. Marinate for 2 to 4 hours. Don’t go longer than 6 hours—acid can break down the meat too much and make it mushy.
Step 3: Bring To Room Temperature
Take the steak out of the fridge 30 minutes before grilling. This helps it cook evenly. A cold steak will char on the outside but stay raw in the center.
Pat it dry with paper towels. Moisture on the surface creates steam, which prevents a good sear. Dry meat equals better browning.
Step 4: Preheat The Grill To High Heat
You want a hot fire. For gas grills, turn all burners to high and close the lid. Wait 10 to 15 minutes. The temp should reach 450°F to 500°F.
For charcoal grills, light the coals and let them ash over. Spread them in a single layer. Hold your hand 5 inches above the grate. If you can’t keep it there for more than 2 seconds, it’s hot enough.
Clean the grates with a wire brush. Then oil them with a paper towel dipped in vegetable oil. This prevents sticking.
Step 5: Grill Over Direct Heat
Place the flank steak on the hottest part of the grill. Leave it alone for 4 minutes. Don’t move it or press it down. Let the heat do the work.
Flip it with tongs. Grill the other side for 3 to 4 minutes. For medium-rare, aim for an internal temp of 130°F to 135°F. Use an instant-read thermometer inserted into the thickest part.
If you like it medium, cook to 140°F. Well-done flank steak gets tough, so try to avoid it.
Step 6: Rest The Steak
This is the most important step. Transfer the steak to a cutting board. Tent it loosely with aluminum foil. Let it rest for 8 to 10 minutes.
Resting allows juices to redistribute. If you cut too soon, all the liquid runs out, leaving dry meat. Be patient.
Step 7: Slice Against The Grain
Look at the steak. You’ll see long lines running from one end to the other. That’s the grain. Slice perpendicular to those lines.
Cut thin slices, about 1/4 inch thick. Cutting against the grain shortens the muscle fibers, making each bite tender. Cutting with the grain gives you long, chewy strips.
Serve immediately. Flank steak cools fast, so don’t let it sit too long.
Common Mistakes When Grilling Flank Steak
Even experienced cooks make errors. Here are the most frequent ones and how to avoid them.
Overcooking
Flank steak has little fat. Overcooking dries it out fast. Use a thermometer and pull it off at 130°F. Carryover cooking will raise it to 135°F.
Not Resting
Skipping the rest leads to a pool of juice on your cutting board. The meat loses moisture and flavor. Always rest for at least 8 minutes.
Cutting With The Grain
This makes the steak tough, no matter how well you cooked it. Always slice against the grain. If you’re unsure, look at the lines before cutting.
Using Low Heat
Flank steak needs high heat for a quick sear. Low heat cooks it slowly, making it gray and chewy. Crank up the grill.
Best Marinades And Rubs For Flank Steak
You can keep it simple or go bold. Here are a few options that work well.
Classic Chimichurri
After grilling, top sliced flank steak with chimichurri. It’s a mix of parsley, garlic, olive oil, vinegar, and red pepper flakes. The acidity cuts through the beef.
Asian-Inspired Marinade
Combine soy sauce, sesame oil, ginger, garlic, and a touch of honey. Marinate for 2 hours. Grill as usual. Serve with steamed rice and vegetables.
Simple Salt And Pepper
Sometimes less is more. Just salt and coarse black pepper. Let the beef flavor shine. This works best with high-quality grass-fed flank steak.
How To Tell When Flank Steak Is Done
Visual cues are unreliable. Use a thermometer for accuracy. Here are the temps for different doneness levels:
- Rare: 125°F (cool red center)
- Medium-rare: 130°F to 135°F (warm red center)
- Medium: 140°F (pink center)
- Medium-well: 150°F (slight pink)
- Well-done: 160°F and above (no pink)
For flank steak, medium-rare is the sweet spot. It stays juicy and tender. Anything past medium starts to get tough.
What To Serve With Grilled Flank Steak
Flank steak pairs well with simple sides. Here are some ideas:
- Grilled vegetables like asparagus, bell peppers, or zucchini
- A crisp green salad with vinaigrette
- Roasted potatoes or sweet potatoes
- Warm tortillas for making tacos
- Rice or quinoa for a hearty meal
You can also slice it thin and serve over a bed of greens for a steak salad. Leftovers are great in sandwiches or wraps.
How To Store And Reheat Leftover Flank Steak
Store leftover steak in an airtight container in the fridge. It will keep for 3 to 4 days.
To reheat, use a skillet over medium heat. Add a splash of beef broth or water. Cover and warm for 2 to 3 minutes. This prevents drying out.
Microwaving is faster but can make it rubbery. If you must use a microwave, do it in short bursts at low power.
You can also slice it cold and add to salads or sandwiches. Cold flank steak is still tasty.
Frequently Asked Questions
Can I Cook Flank Steak On A Gas Grill?
Yes. Gas grills work great. Just preheat to high and follow the same steps. The key is getting the grates hot enough for a good sear.
How Long Do I Grill Flank Steak Per Side?
For a 1-inch thick steak, grill 4 minutes on the first side and 3 to 4 minutes on the second side. Adjust based on thickness and desired doneness.
Do I Need To Marinate Flank Steak?
No, but it helps. Marinades add flavor and can tenderize the meat slightly. If you’re short on time, just salt and pepper work fine.
Why Is My Flank Steak Tough?
Two reasons: you overcooked it, or you cut it with the grain. Always slice against the grain and cook to no more than medium.
Can I Grill Flank Steak From Frozen?
It’s not recommended. Frozen steak cooks unevenly. Thaw it in the fridge overnight for best results. If you’re in a hurry, use the cold water method.
Final Tips For Perfect Grilled Flank Steak
Keep these points in mind every time you grill:
- Always preheat the grill fully before adding the steak.
- Don’t flip the steak more than once. Let it sear undisturbed.
- Use tongs, not a fork, to avoid piercing the meat and losing juices.
- Rest the steak for at least half the cooking time.
- Slice thin and against the grain for maximum tenderness.
With practice, you’ll get a feel for the timing. Every grill is a little different. Trust your thermometer more than your timer.
Grilled flank steak is a weeknight hero. It’s quick, flavorful, and versatile. Once you master the basics, you can experiment with different seasonings and sides.
So fire up the grill, grab a flank steak, and put this method to work. You’ll be glad you did.