Saba-zushi (鯖寿司, Kyoto bō-zushi)

Ingredients

Equipment Needed

• •Makisu (bamboo rolling mat)
• •Hangiri (wooden sushi rice tub), or a wide shallow bowl
• •Pin-bone tweezers
• •Tray with rack
• •Long sharp knife or yanagiba
• •Rice cooker or heavy pot with tight lid

Instructions

1. 1

   Choose the saba

   Buy the mackerel the day you cure it. The skin should shine, the flesh should spring back, and the smell should be clean and faint, not loud. Ask for fish handled for raw preparation and previously frozen for parasite control, then keep it cold over ice until the salt goes on. Salt and vinegar make the fish delicious; they don't make tired fish safe.

   If the mackerel smells strongly fishy or feels soft, change the dish. Salt-grilled saba is honest food; saba-zushi asks for a better beginning.
2. 2

   Salt the fillets

   Set a rack over a tray and lay the fillets skin-side down. Sprinkle the salt over both sides, a little more heavily on the flesh, and refrigerate uncovered for 1 1/2 to 2 hours. The salt pulls water from the fish and tightens the flesh, so the vinegar can season cleanly instead of soaking into something watery and dull.

   The surface should look wet and feel firmer when the cure is ready. Very thin fillets need less time; thick autumn saba can take the full two hours.
3. 3

   Cook the rice

   While the salt does its work, rinse the rice in several changes of water until the water runs almost clear. Wash it twice, wash it thrice, then drain it for 20 minutes. Cook with the measured water, then let it rest covered for 10 minutes. Washing removes loose surface starch, which is what keeps the finished rice glossy and separate instead of pasty.

4. 4

   Season the rice

   Warm the 5 tablespoons rice vinegar, 2 tablespoons sugar, and 1 1/2 teaspoons salt just until dissolved. Turn the hot rice into a hangiri, or a wide shallow bowl, and sprinkle the vinegar over it. Fold with a cutting motion while fanning until the grains shine and the rice is warm rather than hot. Hot rice drinks the vinegar; mashing it only breaks the grains. Cover with a damp cloth.

5. 5

   Rinse and bone

   Rinse the salted mackerel quickly under cold running water, then pat it very dry. Run your fingertips down the center line and pull any pin bones with tweezers. Do not soak the fish now. Water would put back what the salt just drew out, and a wet surface weakens the vinegar cure.

6. 6

   Cure in vinegar

   Stir the 1 cup rice vinegar with 1 tablespoon sugar until the sugar dissolves, then add the small piece of konbu. Lay the fillets in a shallow tray, flesh-side down, and cover the surface with the vinegar. If the liquid does not cover them, lay a paper towel over the top and wet it with the cure. Refrigerate for 30 to 45 minutes, until the edges turn pale and the center still keeps a quiet rose color.

   Vinegar is the second seasoning, not a punishment. Leave the fish too long and the flesh turns chalky all the way through, which is tidy to look at and tired to eat.
7. 7

   Peel the membrane

   Lift the clear outer membrane at the head end with the tip of a knife and peel it toward the tail in strips, leaving the silver-blue skin beneath. Trim any ragged belly edge and keep the trimmings for patching the narrow tail end of the log. The membrane is tough under the teeth, and removing it lets the knife pass cleanly later.

8. 8

   Soften the konbu

   Brush or wipe the shiroita konbu sheets with the vinegar-water mixture and leave them for 5 to 10 minutes, just until pliable. If your sheets are already seasoned and supple, use them as they are. Dry konbu cracks under the mat; a softened sheet hugs the saba and gives the log its quiet sea fragrance.

9. 9

   Roll the logs

   Lay a makisu, the bamboo rolling mat, on the counter and cover it with plastic wrap. Set one konbu sheet on the wrap, then lay one mackerel fillet skin-side down on the konbu, flesh facing up. With damp hands, mound half the sushi rice along the fish and shape it into an even oval, using small trimmings to fill the narrow tail end if needed. Fold the mat over and press from the top and sides into a firm log. Repeat with the second fillet.

   Press steadily, not brutally. You want fish and rice to meet without gaps; crush them and the rice turns heavy and the cut face loses its clean line.
10. 10

    Rest and slice

    Wrap each log tightly, set it seam-side down, and rest it in the refrigerator under a light board or tray for 3 to 6 hours. Bring it out 20 minutes before slicing so the rice loses its hard chill. Unwrap and cut each log into 8 thick pieces with a long damp knife, wiping the blade between cuts. Serve with gari. The sushi is already seasoned, so let the saba, rice, and konbu speak without drowning them.

Chef Tips

• •Ask the fishmonger two plain questions: what came in today, and was it frozen for raw preparation? A label alone is not a safety plan. Mackerel needs careful handling because salt and vinegar do not reliably kill parasites, and they do nothing for histamine.
• •If you can buy excellent prepared shime saba from a Japanese fishmonger, use it without apology. You are still doing the work of Kyoto bō-zushi: proper rice, konbu, pressure, and rest. Canned or smoked mackerel makes another dish.
• •Do not replace the konbu sheet with nori. Nori brings roast and crispness; konbu brings a soft sea fragrance and a slight chew. If you cannot find shiroita or battera konbu, make the log without it and say so plainly.
• •The rice should be warm or at room temperature when you roll. Hot rice warms the fish, and cold rice refuses to bind. The middle path, as usual, saves everyone trouble.
• •Slice with one long pull and wipe the blade after every cut. Saba-zushi shows every hesitation on its cut face. Let the knife do the seasoning.

Advance Preparation

• •The sushi vinegar can be made up to one week ahead and kept refrigerated. Warm it gently or bring it to room temperature before using so the sugar is fully dissolved.
• •The assembled logs need at least 3 hours of rest and are best after 4 to 8 hours, when the fish, rice, and konbu have settled into one another.
• •For home service, keep saba-zushi refrigerated and eat it within 24 hours of assembly. Bring it out 20 to 30 minutes before slicing so the rice softens without leaving the fish sitting out.

Frequently Asked Questions

Nutrition Information

1 serving (about 65g)