Flank Steak vs Skirt Steak: The Ultimate Grilling Guide

If you've ever stood at the butcher counter wondering whether to grab the flank steak or the skirt steak for your next asado, you're not alone. These two cuts are often confused, frequently swapped in recipes, and both beloved across Argentina and the rest of Latin America for good reason. They're flavorful, affordable, and absolutely spectacular when grilled over high heat. But they are not the same cut, and understanding their differences will make you a significantly better griller.

Where Do Flank Steak and Skirt Steak Come From?

Both cuts come from the belly area of the cow, but from slightly different regions. Flank steak — known in Argentina as matambre or sometimes vacio depending on the butcher — comes from the lower abdominal muscles, just behind the plate section. It is a wide, flat, and relatively thick muscle with long, prominent grain lines running across it. Skirt steak, on the other hand, comes from the diaphragm muscle and is divided into two types: inside skirt and outside skirt. The outside skirt is more prized for its tenderness and rich marbling. In Mexican and Tex-Mex cuisine, skirt steak is the traditional cut for fajitas, but Argentine pitmasters have long appreciated its intense beefy character on the parrilla.

The key visual difference is easy to spot once you know what to look for. Skirt steak is long, thin, and loosely textured with visible fat running through it. Flank steak is broader, thicker, and leaner with a tighter grain. Both cuts are tough if cooked incorrectly but absolutely magnificent when handled with care.

Flavor Profile and Texture: Which Cut Wins?

When it comes to raw, unapologetic beefy flavor, skirt steak wins by a landslide. The higher fat content and looser muscle fibers mean that skirt steak absorbs marinades beautifully and delivers an intensely savory, almost buttery bite when cooked to medium-rare. It has more intramuscular fat — that marbling we all love — which renders during grilling and bastes the meat from the inside out. The result is a steak that is juicy, rich, and deeply satisfying.

Flank steak is leaner and slightly milder in flavor, but don't mistake that for boring. It has a clean, meaty taste that lets marinades and chimichurri shine without competing. Its firmer texture also makes it ideal for slicing thin and serving over salads, in sandwiches, or on top of roasted vegetables. If you're feeding guests who prefer a leaner cut, flank steak is the more crowd-pleasing choice. For pure, bold flavor, skirt steak is the champion.

Grilling Techniques: How to Cook Each Cut Perfectly

Both cuts demand high heat and relatively short cook times — this is not the moment for low-and-slow barbecue. Think of them as sprint cuts, not marathon cuts. The goal is a deeply caramelized crust on the outside while the interior stays pink, juicy, and tender. For skirt steak, you are looking at roughly 2–3 minutes per side over screaming hot direct heat. Because it is thinner and more uneven in thickness, keep a close eye on it and move it around the grill as needed to avoid burning the thinner edges.

Flank steak needs a minute or two more per side due to its greater thickness. Some Argentine grillers like to score the surface of flank steak lightly with a knife in a crosshatch pattern before marinating — this helps the flavors penetrate deeper and slightly speeds up the cook time. Both cuts should be rested after grilling, ideally for five minutes under a loose foil tent, before slicing. Skipping the rest means losing precious juices to your cutting board instead of your mouth.

The Golden Rule: Always Slice Against the Grain

This cannot be stressed enough — slicing against the grain is the single most important technique for both flank and skirt steak. Both cuts have long, visible muscle fibers, and if you slice parallel to those fibers, you end up with chewy, stringy pieces that require a lot of chewing. Slice perpendicular to the grain — meaning your knife cuts across those fibers — and you shorten them dramatically, giving you tender, easy-to-eat slices even from what is technically a tough working muscle.

For skirt steak, the grain runs along the length of the cut. Slice across the width. For flank steak, the grain often runs diagonally, so take a moment to observe the direction before cutting. Hold your knife at a slight angle (about 45 degrees) to create wider slices that look beautiful on the plate. Serve immediately with chimichurri, grilled vegetables, or warm tortillas — and watch them disappear.

So Which Should You Choose for Your Next Asado?

The honest answer is: both, if possible. But if you must choose, consider your priorities. Choose skirt steak when you want maximum flavor, a quick cook, and a rich, satisfying eating experience. It's perfect for tacos, fajitas, or served simply with chimichurri and crusty bread. Choose flank steak when you want a leaner option that presents beautifully on a platter, or when you plan to marinate overnight and want a steak that slices cleanly for meal prep or a crowd. Either way, master the technique in this recipe and you'll have one of the most impressive and affordable steaks in your grilling arsenal. Welcome to the asador lifestyle — let the fire do the talking.