We have all been to that backyard barbecue where you end up chewing on a piece of grilled skirt steak that feels suspiciously like a steel-belted radial tire. To grill flank and skirt steak perfectly, you must cook them hot and fast over direct heat for just 3 to 5 minutes per side, then slice them thinly across the grain. These two long, flat cuts are packed with incredible beefy flavor, but their coarse muscle fibers demand high heat to sear the outside without overcooking the inside. Whether you are prepping for a Tuesday night taco feast or trying to impress your in-laws (who will inevitably ask for it well-done anyway), mastering these cuts is a backyard rite of passage.
The Quick Take
The secret to grilling flank and skirt steak is a blazing hot fire and a very short cook time. Grill skirt steak for 2 to 3 minutes per side and flank steak for 4 to 5 minutes per side over direct heat until the internal temperature hits 130°F for medium-rare. Rest the meat for 5 to 10 minutes, and always slice it thinly against the grain to break up the tough muscle fibers and ensure a tender bite.
Key Facts at a Glance
| Detail | Skirt Steak | Flank Steak |
|---|---|---|
| Thickness | Thin (1/2 to 3/4 inch) | Thicker (1 to 1.5 inches) |
| Grill Temp | Direct High Heat (500°F+) | Direct High Heat (500°F+) |
| Cook Time | 2 to 3 minutes per side | 4 to 5 minutes per side |
| Target Internal Temp | 130°F (Medium-Rare) | 130°F (Medium-Rare) |
| Slicing Rule | Against the grain | Against the grain |
Setting Up for Success
While often confused, flank and skirt steaks are completely different cuts. Skirt steak comes from the diaphragm muscle; it is thin, fatty, and has a very loose, open grain that absorbs marinades like a sponge. Flank steak comes from the lower chest or abdominal area; it is thicker, leaner, and has a tighter grain that benefits from a good dry rub or a tenderizing marinade. Because they are both hard-working muscles, they pack a massive punch of beefy flavor, but they require precise handling to stay tender.
The key to success with both cuts is intense, direct heat. You want to build a crust instantly before the heat penetrates too deeply into the thin meat. On an Arteflame grill, this is exactly what the center grate was designed for. Simply pour a little vegetable oil on three paper napkins, place them in the center of the grill, stack your firewood over the napkins, and light the paper. In about 20 minutes, you will have a roaring fire hitting over 1,000°F right in the middle, giving you the ultimate searing zone.
Step-by-Step Instructions
- Prep and Dry the Meat: If you used a marinade, wipe off the excess. Moisture is the enemy of a good sear. Pat the steaks completely dry with paper towels. If you are not marinating, season generously with salt and pepper about 45 minutes before grilling.
- Fire Up the Grill: Build a high-heat fire. You want your cooking surface screaming hot. If using an Arteflame, let the center grate get fully heated by the wood fire.
- Sear Hot and Fast: Place the steak directly over the hottest part of the fire. For skirt steak, leave it for 2 to 3 minutes until a dark crust forms, then flip. For flank steak, give it 4 to 5 minutes per side. If the flames get too aggressive, slide the steak slightly outward to the flat solid-steel cooktop to finish cooking without burning.
- Check the Temperature: Pull the steaks off the grill when they reach an internal temperature of 130°F for a perfect medium-rare.
- Rest the Meat: Place the steak on a cutting board and tent it loosely with foil. Let skirt steak rest for 5 minutes and flank steak for 10 minutes so the juices redistribute.
- Slice Against the Grain: Look at the direction the long muscle fibers are running. Turn your knife perpendicular (90 degrees) to those lines and slice the meat at a slight angle into thin strips.
Pro Tip: Skirt steak is so long that it is often folded in the package. Cut it into two or three shorter, manageable pieces before grilling so it lays completely flat on the grate and is easier to flip with your tongs.
Common Mistakes to Avoid
- Boiling instead of searing: Throwing a dripping wet, marinaded steak onto the grill causes it to steam. Always pat it dry so you get a crust instead of grey, chewy meat.
- Guessing the temperature: Because these cuts are thin, they go from medium-rare to shoe leather in about 60 seconds. Do yourself a favor and use a ThermoWorks instant-read thermometer to pull it exactly at 130°F.
- Under-seasoning: These are robust cuts of beef that need plenty of seasoning. Use a heavy hand with a quality coarse salt, like Diamond Crystal kosher salt, to bring out the flavor.
- Slicing with the grain: This is the cardinal sin of flank and skirt steak. If you cut parallel to the muscle fibers, your guests will be chewing each bite until next Tuesday. Always slice across the grain.
Make It Your Own
- Classic Fajitas: Marinate skirt steak in lime juice, soy sauce, garlic, and cumin. Grill it hot, slice it thin, and serve with charred peppers and onions.
- Chimichurri Heaven: Grill a flank steak with just salt and pepper, then smother the sliced meat in a fresh, garlicky, herb-packed Argentine chimichurri sauce.
- Asian-Inspired Glaze: Marinate flank steak in soy sauce, ginger, brown sugar, and a dash of sesame oil. The sugars will caramelize beautifully on a hot flat steel cooktop.
- Steak Salad: Let your medium-rare flank steak cool slightly, slice it thin, and throw it over arugula with blue cheese and a balsamic vinaigrette.
Frequently Asked Questions
What is the difference between flank and skirt steak?
Flank steak is a thicker, wider, and leaner cut from the abdominal area with a tight grain. Skirt steak is a thinner, narrower, and fattier cut from the diaphragm with a very loose grain. Skirt steak cooks faster and takes marinades better, while flank steak is better for feeding a crowd with uniform slices.
Do I have to marinate skirt steak?
You do not have to marinate skirt steak, but it is highly recommended. Because of its loose muscle structure, skirt steak absorbs the flavors of a marinade incredibly well. If you skip the marinade, a heavy dry rub or just salt and pepper will still yield a delicious, beefy flavor.
How do I find the grain on a steak?
Look closely at the surface of the raw meat before you season it. You will see distinct lines running in one direction, like the grain in a piece of wood. When it is time to carve, position your knife across those lines, not parallel to them, to ensure a tender bite.
Keep the Fire Going
Grilling a flawless flank or skirt steak is one of those skills that instantly elevates your backyard status from "guy with a spatula" to true grill aficionado. Once you master the hot-and-fast sear and the against-the-grain slice, you will never look at taco night the same way again. And if you cooked on an Arteflame, cleanup is as simple as scraping any leftover marinade residue straight into the fire, wiping the flat steel cooktop with a thin coat of oil, and tossing on another log to turn your grill into a fire pit for the rest of the evening. Ready for more? Explore more grilling guides and keep the fire going.