Spicy Tuna Poke Stack

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A spicy tuna poke stack is what you make when you want the satisfaction of a restaurant poke bowl but want something that actually looks like you tried.

The build is simple: sushi rice on the bottom, a layer of diced cucumber and avocado in the middle, and sriracha-marinated sushi-grade tuna on top. A ring mold presses it into a clean tower that holds together when you lift it.

The heat comes from a short marinade of sriracha — the same sriracha-forward glaze approach — toasted sesame oil, and soy sauce. It’s sharp and a little smoky, and it coats the tuna without masking the fish.

This comes together in about 25 minutes once your rice is cooked. I use short-grain Japanese rice for its stickiness, which is what keeps the stack from collapsing.

Why You’ll Love This Recipe

• Restaurant-style presentation built with a ring mold at home
• No raw fish cooking – just a quick marinade and stack
• Spicy sriracha sesame marinade clings to every tuna cube
• High-protein, gluten-adaptable, and on the table fast

Ingredient Notes

• sushi-grade tuna: Buy from a fishmonger who labels it sushi-grade or sashimi-grade. Ahi (yellowfin) works well here – cut it into 1 cm cubes for even marinade coverage.
• sriracha: I use Huy Fong sriracha for its garlic-forward heat. Sambal oelek works if you want more chili and less sweetness.
• kewpie mayonnaise: Kewpie has more umami and a softer tang than standard mayo. Regular mayo plus a few drops of rice vinegar is a decent substitute.
• short-grain sushi rice: Short-grain Japanese rice gets sticky enough to hold the base of the stack. Long-grain rice will not bind and the stack will crumble.
• avocado: Use a ripe but firm avocado so the cubes hold their shape in the middle layer. A soft avocado will compress and slide.
• toasted sesame oil: Just 1 teaspoon adds a nutty depth to the marinade. Do not substitute with regular sesame oil – the toasted version has a different, more pronounced flavor.
• soy sauce: Regular soy sauce works fine. For a gluten-free version, swap in tamari 1:1.

Spicy Tuna Poke Stack

A layered spicy tuna poke stack with sriracha-marinated sushi-grade tuna, cucumber, avocado, and sticky sushi rice. No cooking the tuna required.

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Prep Time 20 minutes mins

Cook Time 20 minutes mins

Total Time 40 minutes mins

Servings: 4 servings

Calories: 420

Ingredients Method Notes

Ingredients

  

Sushi Rice

• 300 g short-grain sushi rice, uncooked rinsed until water runs clear
• 360 ml water
• 2 tbsp rice vinegar
• 1 tsp granulated sugar
• 0.5 tsp fine sea salt

Spicy Tuna

• 450 g sushi-grade ahi tuna cut into 1 cm cubes
• 2 tbsp sriracha adjust to taste
• 2 tbsp kewpie mayonnaise
• 1 tbsp soy sauce or tamari for gluten-free
• 1 tsp toasted sesame oil
• 1 tbsp lime juice, freshly squeezed
• 2 stalks scallions, thinly sliced plus extra to garnish

Middle Layer and Garnish

• 1 medium English cucumber peeled, seeded, cut into 1 cm cubes
• 2 medium ripe but firm avocado cut into 1 cm cubes
• 1 tsp lime juice to toss with avocado
• 1 tbsp toasted sesame seeds to garnish
• 3 tbsp sriracha mayo (extra) kewpie mayo mixed 2:1 with sriracha, for plating drizzle
• 2 sheets nori sheets, cut into strips optional garnish

Method

 

Cook the Sushi Rice

1. Rinse the sushi rice under cold water in a fine-mesh sieve until the water runs clear, about 2 minutes.
2. Combine rice and 360 ml water in a medium saucepan. Bring to a boil over high heat, then reduce heat to the lowest setting, cover, and cook for 15 minutes until all water is absorbed.
3. Remove from heat and let steam, covered, for 10 minutes. Spread rice onto a wide plate or bowl.
4. Stir rice vinegar, sugar, and salt together in a small bowl until dissolved. Fold gently through the warm rice using a rice paddle or spatula. Let cool to room temperature before building the stacks.

Marinate the Tuna

1. Pat the tuna cubes dry with paper towels. Combine sriracha, kewpie mayo, soy sauce, toasted sesame oil, and lime juice in a medium mixing bowl and whisk until smooth.
2. Add tuna cubes and scallions. Toss gently until each piece is coated. Cover and refrigerate for 15 to 20 minutes - no longer or the texture softens.

Prepare the Middle Layer

1. Toss avocado cubes with 1 tsp lime juice to prevent browning. Combine with cucumber cubes in a separate bowl and season lightly with a pinch of salt.

Build the Stacks

1. Place a 7 to 8 cm ring mold on a flat serving plate. Wet your hands slightly.
2. Spoon about 60 g of seasoned sushi rice into the mold. Press down firmly with the back of a wet spoon to form a compact base, about 1.5 cm thick.
3. Add a layer of cucumber-avocado mixture, about 2 heaping tablespoons, and press gently to level.
4. Spoon the marinated tuna on top, about 3 to 4 tablespoons, mounding it slightly in the center.
5. Hold the plate steady with one hand and lift the ring mold straight up in one smooth motion.
6. Drizzle sriracha mayo around the base of the stack. Scatter toasted sesame seeds, extra scallion slices, and nori strips over the top. Repeat for remaining servings.

Notes

If you don't own a ring mold, a clean empty tuna can with both ends removed works well as a substitute. Press firmly at each layer for a clean release.

Tips for Success

• Chill the tuna cubes for 10 minutes after marinating to firm them up before stacking.
• Press the sushi rice layer firmly into the mold first – it is the structural base of the whole stack.
• Run a thin knife around the inside of the ring mold before lifting to prevent the avocado layer from sticking.
• Dice cucumber and avocado to the same 1 cm size as the tuna so each forkful gets an even ratio.
• Season the rice with rice vinegar and a pinch of salt before building – unseasoned rice makes the whole stack taste flat.

Variations

• Swap tuna for sushi-grade salmon and add a teaspoon of miso paste to the marinade.
• Replace sushi rice with cauliflower rice for a lower-carb, grain-free stack that still holds shape.
• Add a thin layer of mango cubes between the avocado and tuna for a sweet-heat contrast.

Storage and Reheating

Store any leftover tuna separately from the rice and vegetables in airtight containers in the fridge. The marinated tuna keeps for up to 24 hours – after that the acid in the sriracha begins to cure the fish and the texture turns mealy.

Cooked sushi rice keeps for up to 2 days, covered, in the fridge. Reheat it with a splash of water in the microwave for 60 seconds before rebuilding. Do not assemble the full stack ahead of serving – it goes soft within 20 minutes of plating.

Serving Suggestions

Plate each stack on a wide, flat bowl or a dark ceramic plate so the colors of the tuna and avocado stand out. Drizzle sriracha mayo around the base and scatter toasted sesame seeds and thinly sliced scallions on top.

A small side of miso-glazed fish and nori make this eat like a full restaurant meal. Pickled ginger on the side cuts through the richness of the avocado and balances the spice.

For a casual spread, skip the mold and serve everything deconstructed in a bowl – same ingredients, same flavors, no stacking required.

FAQ

Why is my spicy tuna poke stack falling apart when I lift the ring mold?

The most common cause is not packing the sushi rice tightly enough at the base. Press it down firmly with the back of a wet spoon before adding the other layers. Make sure the rice is at room temperature, not hot – hot rice steams and softens the avocado, which loosens the whole structure.

Can I use canned tuna instead of sushi-grade tuna in this poke stack?

Canned tuna is not a direct substitute here – the texture is too soft and it won’t cube cleanly. If fresh sushi-grade tuna is unavailable, sushi-grade salmon or even a cooked shrimp poke variation are better options.

How far ahead can I marinate the tuna for spicy poke?

Marinate the tuna for no longer than 20 to 30 minutes before building the stack. The sriracha and soy start to break down the fish proteins quickly, and anything over an hour will give you a mushy texture rather than clean, firm cubes.

What goes well with a spicy tuna poke stack besides miso soup?

Edamame with flaky salt, seaweed salad, or a crisp Asian cucumber salad all complement the stack without competing with the sriracha flavors. A cold Sapporo or a glass of dry Riesling also pairs well with the heat.

Is spicy tuna poke stack gluten-free?

The base recipe contains soy sauce, which has gluten. Swap it for tamari or coconut aminos and check your sriracha label – most brands are gluten-free but it’s worth confirming. With those swaps, the whole stack is gluten-free.

What is the difference between a poke bowl and a poke stack?

A poke bowl serves the same components loose in a bowl, while a poke stack layers them in a ring mold to create a compact, structured tower. The flavors are identical – the stack is purely a presentation format, not a different dish.