Vacío, the Argentine flank, grilled fat-side down.
This is the cut I reach for when I want something that rewards patience. A loose-grained flank wrapped in a fat membrane, cooked low over a medium ember bed until the fat renders into a crackling crust and the meat underneath stays juicy. No marinade, no rush.
Vacío is one of those cuts that scares people who only know the steakhouse. It looks loose, it looks fatty, and they cook it like a quick steak and ruin it. Cooked the Argentine way, it is one of the best things on the parrilla.
The whole secret is the fat membrane. Vacío comes wrapped in a sheet of fat that is part of the cut, not trim, and that membrane is your insurance policy. Lay it down first and give it time, and it renders slowly into a crisp crust that bastes the loose-grained meat from the outside in. It belongs in the same conversation as the other workhorse cuts in my guide to the Argentine cuts, and it earns its place at any full asado. Serve it with a sharp chimichurri and you do not need anything else.
Five steps, in the order that matters
Salt and come to room temperature
Salt the vacío generously with coarse salt on both sides and let it sit out while the fire settles. No marinade, no rub. The fat membrane and the beef do the work.
Build a medium ember bed
You want moderate heat, not a sear. A five-count of heat over the grate, with the grate set to mid height. Vacío is cooked low and patient, not hot and fast.
Fat-membrane side down first
Lay it membrane side down and leave it there, 30 to 45 minutes, letting the fat render slowly and the membrane crisp into a protective crust. This is what keeps the loose-grained meat juicy.
Flip once and finish
Turn it a single time and cook the meat side another 15 to 25 minutes. Vacío is forgiving and actually eats best a touch past medium-rare, around medium, when the membrane is crackling and the inside still juicy.
Rest and slice against the grain
Rest 10 minutes, then slice thin across the loose grain. Cut it the lazy way, with the grain, and a tender cut turns chewy.
What you need
The fire
- Salt both sides. Leave the fat membrane on.
- Medium ember bed, a five-count of heat.
- Fat-membrane side down, 30-45 min.
- Flip once, finish to medium.
- Rest 10 min. Slice thin against the grain.
The fat membrane is the cut, not a flaw. Cook it membrane-side down so it renders and crisps and keeps the loose grain juicy. Vacío is forgiving, so do not rush it off the fire.
From Kocinero · Experience you can't fake. Verdicts you can't buy. · kocinero.com/vacio
You need a real parrilla under it
Vacío lives or dies on heat control. An adjustable grate that lets you hold a medium ember bed and raise or lower the meat is what makes the slow render possible. Here is how to choose it.
Argentine grills (parrillas)
The crank-height parrilla is built for exactly this: hold a steady medium bed, set the grate where the render wants it, and walk a fatty cut up slowly without scorching it.
Read the guideThe best Argentine grills
My roundup of the parrillas worth buying, the ones with a grate you can actually raise and lower, so a cut like vacío gets the patient heat it needs.
Read the roundupCommon questions
What is vacío in English?
Vacío is the flank or flap of the cow, a loose-grained cut from the belly between the ribs and the hip, wrapped in a fat membrane. It is similar to what is sometimes sold as bavette or flap meat.
How do you cook vacío?
Low and slow over a medium ember bed, fat-membrane side down first for 30 to 45 minutes so the fat renders and the membrane crisps, then flipped once to finish, about 60 to 75 minutes total. Slice thin against the grain.
Is vacío the same as flank steak?
It is the Argentine flank, very close to flap meat or bavette. It is looser grained and wrapped in a fat membrane that is part of the cut, which is why it is grilled fat side down to render.
How do you know when vacío is done?
Vacío is forgiving and is usually cooked to about medium, juicier than a lean cut would be at that temperature thanks to the rendered fat. The membrane should be crisp and the meat tender when sliced against the grain.
Fat-side down. Patient heat. Cut across the grain.
Respect those three things and vacío rewards you with a juicy, crackling cut that costs a fraction of the steakhouse names. Cook it over the parrilla it was made for.