One of the most common questions we get at the shop is: "Is this cut tough?" It’s a fair ask. When you look at a Flank or a Flap steak, you see long, prominent muscle fibers that look like they mean business.
But here’s the secret: these "flat steaks" are some of the most flavorful cuts in the Argentine repertoire. Our flank and flap steaks come from some of Argentina's top producers - grass-fed, grain-finished for 120 days for an ideal balance of flavour and texture. They aren't tough; they just require a little bit of "know-how" to unlock their potential.
The Anatomy of Flavor
Both Flank and Flap come from the same general neighborhood- the lower abdominal area, known as "vacio" in Argentina. Because these muscles work hard, they develop deep, beefy character.
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Flank Steak (aka. Vacío Fino): Lean, long, and flat with a tight grain. It’s the athlete of the group - clean flavors and a great choice for steak tacos, steak salads/sandwiches or stir-fries because it stays intact when sliced paper-thin.
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Flap Steak (aka. Vacio Grueso or Bavette): Think of this as the Flank’s richer cousin. It’s more marbled and generally more tender than flank steak, with a looser, shreddy grain that holds onto juices beautifully. Perfect for grilling, classic steak frites, or recipes like tacos, fajitas and stir-fries.
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The Pro Move: In Argentina, some enthusiasts cook the Whole Flap (Medialuna de Vacío). It’s a bit of a project - slow-grilling the full crescent-shaped piece for at least 3 hours - but for everyday cooking, we find the portioned "Bavette" style much more approachable.
Raw flap steak
Flank & Flap: Essential Prep Tips
A few small moves make a massive difference in tenderness. Here is how to handle these cuts like a pro.
- Trim the "Silverskin": You might see a thin, pearly film on the surface called silverskin on some cuts. Unlike fat, this is connective tissue that won’t melt away. Slide a sharp knife just under the edge and peel it back; removing it ensures every bite is perfectly tender.
- Manage the Fat: If your cut comes with more fat than you’d like, feel free to trim it down - especially any hard fat.
- The Argentine Way: If the quality of the beef is this good, you don't need to hide it. Coarse sea salt and a crack of black pepper is the authentic, "less is more" approach.
- Elevate with a Marinade: While not strictly necessary, both cuts are flavor sponges - plus marinating can help to tenderize them. Aim for 2–4 hours for the best balance. You can go up to 12 hours (overnight), but be mindful that highly acidic marinades (lime, vinegar, or wine) can change the meat's texture.
- Ideal for High-Heat Cooking: Both Flank and Flap are ideal for high-heat cooking. Because they are relatively flat with an open grain, they sear quickly on the outside, creating a beautiful crust while staying juicy in the middle. High heat allows you to hit that perfect medium-rare before the center has a chance to overcook.
- Target Medium-Rare: These cuts are at their absolute best when kept to a pink, juicy medium-rare. Because of their grain, they can lose their tenderness if pushed toward well-done.
- The Golden Rule: Slice Against the Grain. This is the single most important step. Identify the direction the muscle fibers are running and always cut perpendicular to them. By breaking those long fibers into short segments, you ensure the beef practically melts instead of being chewy.
The Cooking Guide
1. Flank Steak (Vacío Fino)
Great for: Tacos, fajitas, stir fries, steak salads and sharp, clean slices.
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The Quick Sear: Because it’s thin, Flank loves high heat. 3–5 minutes per side on a hot grill or cast-iron pan is usually plenty for a perfect medium-rare.
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Resting is Key: Let it sit for 10 minutes before touching it with a knife.
2. Flap Steak (Bavette)
Great for: A juicy, "steakhouse-style" dinner at home - as well as fajitas, tacos and stir-fries.
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The Oven Roast (Easy & Consistent): Preheat your oven to 200°C. Sear the steak in a hot pan for 2 minutes per side to develop a deep, dark crust. Transfer the pan to the oven for just 3–5 minutes. The Golden Rule: Pull it out the moment it hits 52°C. It will continue to rise a few degrees while resting, landing at a perfect medium-rare.
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The Grill: Treat it with respect. High heat is essential, but timing is everything. Grill for about 3 minutes per side. Because flap steak has a loose grain, it’s more "forgiving" than flank, but the goal is still a bright pink center for maximum juiciness.
The Bottom Line
Don't let the prominent grain intimidate you. These are smart, high-value cuts that reward a little bit of heat and a sharp knife. They are the "insider's choice"—the steaks we reach for when we want real flavor without the fuss.