Flap Steak
Flap steak (also sold as flap meat or, confusingly, sirloin tip steak) is cut from the bottom sirloin, the same general area as tri-tip but a thinner, looser-grained muscle. It has a long, coarse grain similar to skirt or flank steak, a beefy flavor, and takes well to marinades because of its open texture. Uncooked, it looks ragged and uneven in thickness, which is normal for this cut.
Varieties
Flap steak, flap meat, and bavette generally refer to the same bottom sirloin cut. "Sirloin tip steak" sometimes gets used for this cut too, but true sirloin tip (from the round) is a different, leaner muscle, so confirm with a butcher if the label says only that.
Buying tips
Look for a piece with even red color and visible marbling flecked through the grain rather than large fat pockets. It's often labeled inconsistently as flap meat, sirloin tip, or bavette, so ask the butcher to confirm it's from the bottom sirloin if the label seems ambiguous. Thickness varies naturally within one piece; that's expected and not a sign of poor trimming.
Substitutes
Skirt steak — 1:1
Very similar coarse grain and beefy flavor; cooks slightly faster because it's thinner.
Flank steak — 1:1
Leaner and a bit more tender when sliced thin against the grain; less fat than flap steak.
Hanger steak — 1:1
More tender and slightly richer in flavor, but costs more and can be harder to find.
Bavette (sirloin flap in French butchery) — 1:1
Often the exact same cut under a different name at specialty butchers.
Storage
Keep refrigerated in its original packaging and use within 3 to 5 days, or freeze for up to 6 months wrapped tightly in plastic and foil. Because the muscle is thin and irregular, it thaws faster than thicker steaks, so move it to the fridge the night before rather than leaving it out.
How to use
Best marinated for at least 30 minutes (its open grain absorbs marinade faster than denser cuts) and cooked hot and fast: grilled or seared 3 to 5 minutes per side for medium-rare, then rested 5 to 10 minutes. Always slice thin against the grain; because the grain runs at odd angles across the uneven surface, check the direction in each section before cutting. Common in carne asada, fajitas, and Korean-style bulgogi.
What it pairs with
Pairs well with acidic marinades (lime, vinegar, citrus), chimichurri, garlic and cumin rubs, and charred vegetables. Works in the same dishes as skirt or flank steak: tacos, rice bowls, and salads with a punchy dressing.
Nutrition
A 4-ounce cooked portion runs around 200 to 230 calories with roughly 25 to 28 grams of protein. It has more marbling than flank steak but less than ribeye, putting it in a middle range for fat content among steak cuts.
FAQ
Is flap steak the same as skirt steak?
No, they come from different parts of the cow (bottom sirloin versus the diaphragm area), but they share a similar coarse grain and both benefit from the same marinate-then-sear approach.
Why does my flap steak turn out chewy?
It's almost always a slicing issue: cutting with the grain instead of against it, or cutting too thick. Slice thin, about a quarter inch, and cut perpendicular to the visible muscle fibers.
Do I need to marinate flap steak?
Not required, but its open grain takes on marinade quickly, so even 30 minutes makes a noticeable difference in flavor and tenderness compared to cooking it plain.
What's the best way to tell doneness without a thermometer?
Because the steak is thin and uneven, a thermometer reading in one section can be off in another; press the thickest part with tongs and pull it at medium-rare firmness (springy but yielding), then rest before slicing.
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