Cuban-Japanese fusion recipe

Soy-Marinated Tuna Donburi with Avocado and Ripe Plantain

Name: Soy-Marinated Tuna Donburi with Avocado and Ripe Plantain
Prep time: 25 min
Cook time: 30 min
Total time: 115 min
Ingredients: 320 g short-grain Japanese rice; 400 ml water (approx., adjust according to package instructions); 600 g cleaned tuna, suitable for raw consumption; 250 g prepared avocado; 200 g cucumber; 160 g peeled ripe plantain; 2 sheets nori seaweed; 15 g chives; 5 ml vegetable oil; 60 ml soy sauce; 30 ml water; 20 ml sour orange juice; 6 g grated ginger

A Cuban-Japanese fusion donburi: tuna marinated in soy and sour orange over white rice, with avocado, cucumber and roasted ripe plantain.

CiberCubaNovember 11, 2026

AI-generated image.CiberCuba

Preparation25 min
Cooking30 min
Total time1 h 55 min
Servings4 bowls
DifficultyMedium

This donburi is a contemporary Cuban-Japanese fusion dish: a bowl of unseasoned Japanese white rice topped with slices of zuke-style marinated tuna, creamy avocado, fresh cucumber and diced roasted ripe plantain for a sweet, caramelized touch.

This is a creative adaptation of contemporary cooking. It belongs to neither Cuban nor Japanese historical tradition, and it is neither sushi nor chirashi: the rice is made without vinegar or sugar.

Sour orange adds acidity and a Cuban accent to the soy and ginger marinade. This is a fresh main course, ideal for hot days, but it requires attention to the source of the fish and the cold chain.

Method

Before starting, confirm that the tuna comes from a reliable supplier, is specifically intended for raw consumption and has undergone validated parasite control. Start with fish that has already been treated and thawed in the refrigerator, and keep it at 4 °C or below until ready to use.
Wash the rice until the water runs nearly clear. Cook it covered with the specified amount of water, following the package instructions, without vinegar or sugar.
AI-generated image.CiberCuba
As soon as it is ready, spread the rice in clean, shallow containers and place it in the refrigerator to cool quickly. Do not leave it at room temperature for long.
AI-generated image.CiberCuba
Preheat the oven to 200 °C. Toss the diced ripe plantain with the oil and roast for about 15-20 minutes, until golden and caramelized at the edges.
AI-generated image.CiberCuba
Transfer the roasted plantain to a shallow container and cool it separately in the refrigerator.
Prepare the marinade: mix the soy sauce, water, sour orange juice and grated ginger. If you want extra sauce for serving, reserve a clean portion now in a separate container, before it touches the fish.
AI-generated image.CiberCuba
Using a clean knife and cutting board reserved for raw fish, cut the tuna into slices. Cover it with the marinade and leave it in the refrigerator for 15 minutes.
AI-generated image.CiberCuba
Meanwhile, cut the avocado and cucumber, chop the chives and cut the nori sheets into thin strips, using utensils separate from those used for the raw fish.
Drain the tuna and discard the marinade that came into contact with the raw fish.
Assemble only when ready to serve, with all the ingredients cold: divide the cold rice among four bowls and top with the tuna, avocado, cucumber and a few pieces of ripe plantain. Finish with the nori strips and chives, and serve immediately.
Do not keep leftovers of the dressed fish. If you prefer a fully cooked version, see the alternative in the notes.

Tips and variations

Safety with raw or partially raw fish. Buy tuna from a reliable supplier who specifically intends it for raw consumption, and confirm that they have applied parasite controls appropriate to the species and its origin, normally through freezing validated by the supplier. Freshness alone is never a guarantee. Start with fish that has already been treated and thawed in the refrigerator, and keep the fish, marinade and raw preparations at 4 °C or below.

What does not protect you. Citrus, soy, miso, kombu and searing or lightly cooking only the outside do not make the raw center safe. Proper freezing controls parasites, but does not eliminate all harmful microorganisms, and no measure guarantees zero risk. Use clean, separate utensils and cutting boards for the raw fish and the other ingredients.

Serving and leftovers. Assemble and serve immediately after preparation. Do not keep leftovers of the dressed fish.

Fully cooked alternative. For pregnant people, children, older adults and immunocompromised people, cook the tuna (or another suitable fish) until it reaches 63 °C in the center, for example by pan-searing it in pieces or thick slices, and serve it warm or cold over the bowl. The result is different: the texture is firm, not juicy and translucent, and the flavor is more like cooked fish than raw marinated fish.

About the rice. Cool it quickly in shallow containers in the refrigerator and do not leave it at room temperature for long. It is white rice without vinegar.

Gluten. Soy sauce usually contains wheat, so this recipe is not labeled gluten-free.

Variations. You can add a few drops of extra soy sauce reserved before it touches the fish, or sesame seeds when serving.