Tuna Nigiri at Home (Maguro)

By Sprig Originals ✓ · cooked up in Sprig

The gateway to home sushi: one good block of tuna loin, properly seasoned sushi rice, and a confident 45-degree slice. No rolling mats, no special tools — just cold fish, warm rice, and a little practice with your hands. Makes about 20 pieces, enough for two people as a light dinner or four as an appetizer course.

Ingredients

• 1 1/2 cups Japanese short-grain rice (sushi rice)
• 1 3/4 cups cold water, plus more for rinsing
• 3 tablespoons unseasoned rice vinegar
• 1 1/2 tablespoons granulated sugar
• 1 1/2 teaspoons fine sea salt
• 1 inch piece kombu (optional)

• 12 ounces sushi-grade tuna loin block (akami or chutoro), well chilled

• 1 cup water
• 1 tablespoon rice vinegar
• 1 teaspoon wasabi paste (or freshly grated wasabi)
• 1/4 cup soy sauce, for dipping
• 2 tablespoons pickled ginger (gari)

Instructions

1. Buy the fish first, and buy it right. Ask the fishmonger for a rectangular loin block of tuna labeled sushi-grade or sashimi-grade — ideally a piece 2 to 3 inches wide and at least 1 1/2 inches thick, with the grain running clearly in one direction. Avoid pre-sliced steaks and anything treated with carbon monoxide (unnaturally bright, uniform cherry-red). Keep it in the coldest part of your fridge (34–38°F), wrapped in paper towel inside a zip bag, and use it within 24 hours of purchase.
2. Rinse the rice: place it in a bowl, cover with cold water, and swirl vigorously with your hand for 15 seconds. Pour off the cloudy water and repeat 4 to 5 times, until the water runs nearly clear. Drain in a fine sieve and let sit 15 minutes.
3. Cook the rice: combine drained rice, 1 3/4 cups cold water, and the kombu in a heavy saucepan. Bring to a boil uncovered over medium-high heat, then cover, reduce to the lowest heat, and cook 12 minutes. Remove from heat and let stand, covered, 10 minutes. (Or use a rice cooker on the white-rice setting with the same water ratio.)
4. Make the seasoning (sushi-zu) while the rice cooks: warm the 3 tablespoons rice vinegar, sugar, and salt in a small saucepan over low heat, stirring just until dissolved — 1 to 2 minutes. Do not boil. Set aside to cool to room temperature.
5. Season the rice: discard the kombu and turn the hot rice out into a wide, non-metallic bowl or a rimmed wooden/plastic tray. Drizzle the sushi-zu evenly over the surface. Using a rice paddle or wooden spoon held like a knife blade, cut and fold through the rice in slicing motions — never stir or mash — until the vinegar is absorbed and every grain glistens, about 2 minutes. Fan it with a magazine or paper plate as you go to cool it faster and add gloss.
6. Cover the rice with a damp clean kitchen towel and let it come down to just-warm body temperature, about 95–100°F (roughly 20 minutes). This is the correct nigiri temperature: warmer than the fish, cool enough not to cook it. Never refrigerate sushi rice — it goes hard and chalky.
7. Trim the tuna block: pat it very dry. With a long, sharp knife, square off the block so you have a clean rectangle about 2 1/2 inches wide and 1 1/4 inches tall, cutting away any sinewy silver lines, dark bloodline, and ragged edges. Save the trim for a spicy tuna snack. Identify the grain — the fine parallel lines running through the flesh — and set the block so the grain runs left to right in front of you.
8. Slice: hold the knife at a 45-degree angle to the board, blade tilted away from you, and slice across the grain in one long, smooth pull-through stroke — start with the heel of the blade and draw it back toward you, letting the knife do the work. Each slice should be about 1/8 to 3/16 inch thick and roughly 1 inch by 2 1/2 inches, with a slight diagonal face. Aim for 20 slices. Lay them on a chilled plate, cover, and return to the fridge while you set up.
9. Set up your hands: stir the 1 tablespoon vinegar into 1 cup water in a small bowl — this is tezu, your hand-dipping water, and it keeps rice from welding to your palms. Have the wasabi, tuna, rice, and a serving platter within reach.
10. Form each piece: dip your fingertips in tezu and shake off the excess. Scoop about 2 tablespoons (18–20 g, roughly a rounded golf-ball's worth) of rice and roll it lightly in your cupped right palm into a soft oblong about 1 3/4 inches long. Squeeze gently — the goal is a shape that holds together but collapses in the mouth. Set it down and repeat until all the rice is portioned (about 20 mounds).
11. Marry fish to rice: lay a tuna slice across the fingers of your left hand. Smear a dab of wasabi (about the size of a grain of rice) in the center of the fish. Place a rice mound on top, press once with your right thumb to dish the rice slightly, then flip the whole thing fish-side-up into your palm. Cup your fingers over the fish and press gently along the top and both sides, rotating once, to seal. Two light presses is plenty — overworking makes a dense brick.
12. Arrange the nigiri on a platter as you go, fish-side up, and serve within 20 minutes at cool room temperature. Pour soy sauce into small dishes and set out the pickled ginger to eat between pieces. To eat properly, turn the piece over and dip only the fish edge in soy — dipping the rice makes it fall apart and oversalts the bite.

Chef's tips

Nutrition (per serving, estimated)

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