Can I use regular American mayo instead of Kewpie?

You can, but the result is noticeably different. Kewpie is made with rice vinegar (less sharp), only egg yolks (richer, creamier), and a small amount of MSG — a combination that produces a mayo that is subtly sweet, very rich, and mild. American mayo (Hellmann's, Duke's) uses distilled vinegar and whole eggs, which gives it more tang and a lighter texture. For spicy tuna, the tanginess of regular mayo can compete with the tuna's flavor and the sriracha's heat in a way that Kewpie does not. Kewpie is available at most Asian grocery stores (H Mart, Mitsuwa, 99 Ranch) and increasingly at mainstream grocery stores in the Asian foods aisle. If you must substitute, use the lightest, least-tangy regular mayo you have and add a very small pinch of sugar to move the flavor profile slightly toward Kewpie.

Why does my rice fall apart or come apart when frying?

Three causes. First, the rice was not pressed firmly enough — the block needs to be very dense. Use a flat-bottomed cup or your palm through a sheet of plastic wrap to compress the rice as hard as you can; you should see the block shrink by 20 to 30 percent as you press. Second, the rice was not cold enough — it needs to be refrigerated until cold all the way through, which takes at least 2 hours for a 1-inch block. If the center is still warm, the structure is too soft to survive frying. Third, the oil temperature was too low — below 325°F, the rice absorbs oil and softens rather than forming a crust quickly. At 350°F, the exterior seizes into a crust within 30 to 45 seconds of contact with the oil, holding the block together for the rest of the frying time. Use an instant-read thermometer and do not add so many pieces at once that the oil temperature drops.

Can I make the components ahead of time — how far ahead can each part be prepared?

The rice block can be pressed and refrigerated up to 24 hours ahead, tightly wrapped — this actually improves the result since the rice has more time to firm up and the starch sets fully. Do not fry ahead; fried rice pieces will soften within 15 minutes and become chewy. The spicy tuna can be prepared up to 2 hours ahead and kept refrigerated, covered. Beyond 2 hours, the mayo begins to break down the tuna's texture. For a dinner party: press and refrigerate the rice the night before, prepare the tuna 30 minutes before service, fry the rice in batches just before plating. Assemble at the table for maximum temperature contrast.

Can I pan-fry the rice instead of deep-frying it?

Yes, but the result is a different dish. Pan-frying with a thin layer of oil (about 2 tablespoons in a skillet) produces a browned, crisped surface on the top and bottom but leaves the sides soft. The texture is closer to a pan-fried rice cake than to the Nobu version's fully encased crispy shell. If you pan-fry, use a cast-iron or carbon-steel skillet over medium-high heat, 2 to 3 minutes per flat side until deep golden, pressing gently with a spatula. The result is genuinely good, just different — think Korean dubu jorim texture rather than a fried shell that shatters. If deep-frying at home is a barrier, pan-frying is a legitimate substitution.

What oil temperature is correct, and what happens if it is too hot or too cold?

Target 350°F (175°C). At 350°F, the surface of the rice seizes into a crust within 30 to 45 seconds, which locks the block together and prevents oil absorption. Below 325°F, the oil soaks into the rice before the crust can form, producing a greasy result. Above 375°F, the exterior browns and darkens very quickly — in 90 seconds rather than 2 to 3 minutes — which means the interior stays cold and the crust can turn bitter before it has crisped through. Use an instant-read thermometer or a candy/fry thermometer clipped to the pot. Let the oil return to 350°F between batches — adding cold rice pieces will drop the temperature by 10 to 20 degrees. A small heavy saucepan with just 2 inches of oil recovers temperature faster than a wide pot with a large oil mass.

Nobu Crispy Rice with Spicy Tuna

Name: Nobu Crispy Rice with Spicy Tuna
Prep time: 30 min
Cook time: 10 min
Total time: 40 min
Yield: 4
Cuisine: Japanese
Ingredients: For the crispy rice:; 1 cup short-grain sushi rice (Japanese short-grain; do not use long-grain or jasmine); 1 1/4 cups water; 3 tablespoons unseasoned rice vinegar; 1 tablespoon + 1 teaspoon granulated sugar; 1 teaspoon fine sea salt; Neutral oil for deep-frying — vegetable, canola, or rice bran (about 2 inches depth in a small heavy saucepan); For the spicy tuna:; 8 oz (225g) sushi-grade yellowfin tuna (ahi), very cold; 3 tablespoons Kewpie mayonnaise (Japanese mayo — do not substitute regular mayo); 1 to 2 teaspoons sriracha, to taste; 1/2 teaspoon toasted sesame oil; 1 teaspoon soy sauce (regular or light); 1 scallion, white and pale green parts only, very finely minced; Pinch of fine sea salt; For serving:; 1 jalapeño, sliced into thin rounds; 1 teaspoon tobiko or masago (flying fish roe — optional; adds color, brine, and texture); 1 teaspoon toasted sesame seeds (optional); Small drizzle of soy sauce or ponzu to finish (optional)

Prep time: 30 min (plus 2 hours or overnight chill) Cook time: 10 min Servings: 4 (about 12–16 pieces) Difficulty: Medium

Sushi rice pressed into a block, deep-fried until the shell shatters, topped with cold Kewpie-dressed spicy tuna and jalapeño. The most-copied appetizer Nobu ever put on a menu — at a fraction of the $28–37 per order it runs at the restaurant.

What Is Nobu’s Crispy Rice?

Nobu’s crispy rice is a composed appetizer: compressed sushi rice, deep-fried until the exterior forms a thin, hard, golden crust around a warm, soft center, then topped with cool spicy tuna and a jalapeño round. It sounds simple. The execution is what separates the restaurant version from home attempts — specifically the deep-fry, which creates a textural contrast no other cooking method replicates.

The dish appears on the menu as “Crispy Rice with Spicy Tuna, Salmon, or Yellowtail.” Yellowfin tuna (ahi) is the most common ordering choice and what most copycat versions are designed around.

The Two Things That Matter Most

Deep-fry, not air-fry or pan-fry. The shell on Nobu’s crispy rice is thin and hard — it cracks when you bite through it, the way a fried wonton wrapper does. That crack requires full oil immersion at 350°F. Air fryers and pan-frying create a browned exterior, but the crust is soft and yielding rather than shattering. If you want the Nobu texture, the deep-fry is not optional.

Hand-dice the tuna, never process it. Kewpie and sriracha, folded into roughly 1/4-inch tuna cubes, produce a topping with genuine chew and fish flavor. Processed into paste, the same ingredients produce something closer to a dense spread — the texture is gone and the flavors blur together. Dice cold; fold gently; serve immediately.

Why Kewpie and Not Regular Mayo?

Kewpie is made with rice vinegar (mild, slightly sweet) and only egg yolks (richer than whole eggs), plus a small amount of MSG. The result is a mayo that is very creamy, subtly sweet, and less tangy than American mayo. In spicy tuna, it coats the fish without competing with it. Regular American mayo is tangier and slightly sharper — it works in a pinch, but the difference is noticeable in a preparation this simple.

Kewpie is available at most Asian grocery stores and increasingly at mainstream supermarkets in the Asian foods aisle. The distinctive red-and-white squeeze bottle is the reference.

Cost: Restaurant vs. Home

	Nobu NYC	Homemade
Order size	~4 pieces	12–16 pieces
Price per order	$28–37	~$14 total
Price per piece	$7–9	~$1
Tuna quality	Sushi-grade yellowfin	Sushi-grade yellowfin

The largest cost at home is the tuna. Sushi-grade yellowfin runs $20–28 per pound at Japanese grocery stores. The 8 oz in this recipe costs about $10–14 and produces significantly more pieces than a single Nobu order.

Make-Ahead Guide

Rice block: press and refrigerate up to 24 hours ahead (actually better than just 2 hours — the starch has more time to set)
Spicy tuna: prepare up to 2 hours before serving, refrigerated
Fried rice: do not fry ahead — it softens within 15 minutes
Assembly: assemble immediately before serving

For a dinner party, press the rice the night before. Mix the tuna 30 minutes before guests arrive. Fry in batches just before you plate.

Frequently Asked Questions

What makes Nobu’s crispy rice different from the TikTok viral version? Deep-frying at 350°F creates a shattering shell no air fryer can replicate. The tuna is hand-diced (never processed into paste), and Kewpie mayo is creamier and less sharp than American mayo. The TikTok versions are good; this is a different texture entirely.

Why does my rice fall apart when frying? Three causes: the rice was not pressed firmly enough, it was not cold all the way through when it went into the oil, or the oil was below 325°F. Press very hard, chill for the full 2 hours minimum, and use a thermometer.

Can I pan-fry instead of deep-frying? Yes. Two tablespoons of oil in a cast-iron skillet over medium-high, 3 minutes per flat side. The texture is softer — no shattering shell — but the flavor is there. It is a different dish.

How do I know if tuna is sushi-grade? Buy from a fishmonger or Japanese grocery store that explicitly sells it for raw consumption. Ask when it arrived. “Sushi-grade” is not a regulated term in the US; what matters is the freshness, cold chain, and whether the fish was flash-frozen to kill parasites per FDA guidance.

Can I make this ahead? Press and refrigerate the rice up to 24 hours ahead. Prepare the tuna up to 2 hours ahead. Do not fry ahead; fry just before service.

Nobu is a trademark of its owner, used here only to describe the dish this recipe recreates. This is an independent copycat written in our own words — Copycat Spices is not affiliated with, endorsed by or sponsored by Nobu.

Nobu Crispy Rice with Spicy Tuna

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