Zabuton: Japan's Cushion Cut, and Why It Belongs in Cast Iron
There is a cut of beef named after a floor cushion. It comes out of the shoulder, which is the last place most people look for a tender steak, and in Japan it is one of the most requested items at a yakiniku table. Almost nobody in America has heard of it.
Australian Wagyu Zabuton, Silver Label (BMS 6/7)
What Is Zabuton?
Zabuton (座布団) is the Japanese name for a flat, well-marbled muscle pulled from the chuck, just under the shoulder blade. The word means "floor cushion," and it is a literal description. Laid out whole, the cut is a thick, squared-off rectangle that looks exactly like the cushions people kneel on at a low Japanese table.
You may have met it under a different name. American butchers usually call it the Denver steak. Some shops label it underblade or chuck flap tail. It is all the same muscle, the serratus ventralis, and the reason it goes by so many names is that it was only isolated and sold as a steak relatively recently. For most of butchery history it went straight into the grind.
That is the part worth sitting with. This cut spent a century being turned into ground beef because nobody had bothered to separate it out. It took a beef industry research program in the early 2000s to identify it as a steak worth selling on its own.
Why a Shoulder Cut Is This Tender
The general rule with beef is that hard-working muscles are tough. The chuck does a lot of work, which is why most of it becomes pot roast and chili meat. Zabuton is the exception because of where it sits: tucked underneath the shoulder blade, insulated from most of the load the rest of the chuck carries.
The result is a muscle with the marbling density of the chuck, which is the most heavily marbled primal on the animal, without the connective tissue that makes the rest of it need four hours in a Dutch oven. On a wagyu carcass that combination is unusual. You get intramuscular fat running through a muscle that is already naturally tender.
Gold Label marbling at BMS 8/9. The loose grain is what lets the fat sit this evenly through the muscle.
Butcher's Note
There is one thing to know before you cook it. Zabuton has a thin seam of connective tissue running down the center of the whole muscle. On a properly portioned steak that seam is either removed or sits at the edge where it renders out. If you ever buy one whole and find a line of silverskin through the middle, that is normal. Trim it, and you get two clean steaks instead of one steak with a chewy stripe.
Zabuton vs. The Cuts It Gets Confused With
Three cuts come out of the same general neighborhood, and they get mixed up constantly. They are not interchangeable.
| Zabuton | Flat Iron | Ribeye Cap | |
|---|---|---|---|
| Muscle | Serratus ventralis | Infraspinatus | Spinalis dorsi |
| Location | Under the blade | Over the blade | Rib primal |
| Texture | Soft, loose grain | Dense, uniform | Loose, buttery |
| Marbling | Heavy | Moderate | Heaviest on the animal |
| Best method | Cast iron, yakiniku | Grill, cast iron | Thin slice, fast sear |
| Price position | Mid | Entry | Premium |
The short version: flat iron is the value play, ribeye cap is the luxury play, and zabuton sits between them with more marbling than the flat iron and a lower price than the cap. If you like ribeye cap but not what it costs, this is the cut to try.
Why This Is a Cast Iron Cut, Not a Grill Cut
Zabuton is not a great grilling steak, and it is worth being honest about why. The marbling is heavy and the steak is comparatively thin, so over open flame the fat renders fast, drips, and flares. You end up chasing hot spots and pulling the steak off scorched on the outside before the center has come up.
In a pan, all of that rendering fat stays in the pan and bastes the steak instead of catching fire under it. This is a cut that gets better when you cook it indoors, which makes it a natural for the months when the grill cover stays on.
How to Cook Zabuton
Cast Iron (The Default)
1. Pull from the fridge 30 minutes ahead. Pat completely dry. Salt both sides.
2. Heat cast iron over high heat until it just starts to smoke. Skip the oil at Gold Label and above. There is enough fat in the steak.
3. Sear 2 to 3 minutes on the first side. Do not move it.
4. Flip once. Another 2 minutes. Pull at 125°F.
5. Rest 5 minutes. Slice against the grain, which on this cut runs the long way down the steak.
Seared in cast iron and sliced against the grain.
Yakiniku Style (How Japan Eats It)
At a yakiniku restaurant, zabuton arrives sliced thin and raw, and you cook it yourself over a small grill in the middle of the table. Each piece takes about thirty seconds a side. You eat it as you go, one slice at a time, usually with nothing but salt or a light dipping sauce.
1. Freeze the steak for 30 to 40 minutes. This firms it enough to slice cleanly.
2. Slice against the grain at about a quarter inch.
3. Cook on a hot griddle or grill pan, 30 to 45 seconds a side.
4. Serve with flaky salt, a squeeze of lemon, or ponzu. Rice on the side.
This is the better method if you are feeding several people, because one steak stretches a long way when it is served a slice at a time and everyone is cooking at the table. It turns dinner into something people participate in rather than something that arrives on a plate.
Silver Label or Gold Label?
We carry zabuton at two grades, both F4 Purebred Australian Wagyu and both Halal certified.
Silver Label (BMS 6/7) is the one we would point most people to first. At this marbling level the cut still eats like a steak and holds up to a full portion. If you are cooking it in cast iron for a weeknight dinner, this is the grade.
Gold Label (BMS 8/9) is richer and better suited to the yakiniku approach, where you are eating smaller amounts more slowly. It is also the grade to choose if you are serving it as a course rather than a main.
What to Serve With It
Japanese: Short-grain rice, a bowl of miso, quick-pickled cucumber. The acid and the salt cut the fat and the rice carries it.
Western: Roasted mushrooms in the rendered fat left in the pan, and something green with a sharp vinaigrette.
Wine: The marbling wants acidity to cut through it. A medium-bodied red works better here than a heavy one. Our full wine pairing guide goes deeper.
Zabuton FAQ
Is zabuton the same as Denver steak?
Yes. Same muscle, different naming convention. Zabuton is the Japanese term, Denver steak is the American one. You will also see it sold as underblade or chuck flap tail.
Why is it called a cushion?
Because of the shape. A whole zabuton is a thick, flat rectangle, which is the same shape as the floor cushions used at traditional low Japanese dining tables. The name is descriptive, not poetic.
How much zabuton is on one animal?
Not much. It is a single muscle per side, and after trimming you are left with a few pounds of usable steak from the whole animal. That is part of why it is not a supermarket item.
Can I grill it?
You can, but we would not lead with it. The heavy marbling and thinner profile mean the fat renders fast over open flame and causes flare-ups. If you do grill it, use two-zone heat and keep it moving off the direct side. Cast iron gives you a better result with less attention.
What doneness should I cook it to?
Medium-rare. Pull at 125°F and let carryover bring it to about 130°F. The loose grain means it takes on heat quickly, so a thermometer helps more here than on a thick ribeye.
Is it worth it compared to a ribeye?
It is a different eating experience rather than a lesser one. Ribeye gives you a bigger, more familiar steak. Zabuton gives you denser marbling in a smaller package for less money. If you have been buying ribeye by default, this is a worthwhile detour.
Zabuton at a Glance
Also Called
Denver steak, underblade, chuck flap tail
Primal
Chuck, under the blade
Best Method
Cast iron or yakiniku
Pull Temp
125°F, rest to 130°F
The Cushion Cut
Japan's Yakiniku Favorite, In Your Cast Iron
Australian Wagyu Zabuton, F4 Purebred and Halal certified. Individually portioned and shipped frozen on dry ice from our USDA facility.