Creamy, spicy tuna over savory rice with crisp cucumbers and roasted seaweed. This easy Japanese spicy tuna rice bowl recipe is ready in just 10 minutes! I season the hot rice with soy sauce and sesame oil for more flavor in every bite.
Add the freshly cooked rice to a large serving bowl. If using refrigerated leftover rice, cover and microwave in 1-minute intervals until steaming hot.
Add the soy sauce and toasted sesame oil to the hot rice. Mix well with a rice paddle or spoon until evenly coated. Cover to keep warm.
Drain the canned tuna through a fine-mesh sieve, gently pressing out excess liquid with a fork. Spoon half the tuna over the rice, adding more if desired.
Top with thinly sliced cucumbers, then drizzle with sriracha and Japanese mayo to taste.
Sprinkle with roasted seaweed flakes. Mix everything together. Cut the nori sheets into squares, then use them to scoop up the rice and toppings. Serve immediately.
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