The bite
A neat rectangle of vinegared rice topped with a thin slab of vinegar-cured mackerel and a translucent sheet of sweet-pickled kombu (shiro-ita kombu) over the top. Pressed firm in a wooden mold, sliced into squares. The fish is silver-skinned, pink underneath, soft but not raw-soft — the vinegar has tightened it. Eat with pickled ginger, no soy needed.
Where it comes from
An Osaka pressed-sushi (oshizushi) developed in the Meiji era (late 19th century), originally using gizzard shad (konoshiro) shaped like the flat-bottomed river barge known as a 'bateira' in Portuguese — the loanword that gives the dish its name. When shad ran scarce, mackerel took over and stuck. It predates Edo nigiri in the region — Osaka-style pressed sushi was the older form.
What makes it work
Curing is the load-bearing step — mackerel is salted heavily for 30–60 minutes (drawing out water and oxidation), rinsed, then bathed in rice vinegar 20–40 minutes depending on size. Under-cure and the fish reads slack and fishy; over-cure and the flesh goes opaque-white and rubbery. The kombu sheet on top isn't decoration — it cuts the oily mackerel with a sweet-sour wrap.
On the Palate
What goes into it
How it's made
- 1
Marinate mackerel fillets in vinegar, sugar, and salt mixture.
- 2
Prepare sushi rice by seasoning cooked rice with vinegar, sugar, and salt.
- 3
Line a sushi mold with mackerel fillets.
- 4
Pack the vinegared rice tightly on top of the mackerel.
- 5
Press and slice into rectangles before serving.
