01 - Rinse sushi rice under cold water until the water is clear. Combine rice and water in a saucepan. Bring to a boil, then cover and reduce heat to low. Simmer for 10 minutes, remove from heat, and let stand covered for another 10 minutes.
02 - Mix rice vinegar, sugar, and salt until dissolved. Gently fold this mixture into the cooked rice. Allow the rice to cool slightly before serving.
03 - In a bowl, whisk together soy sauce, sesame oil, rice vinegar, sriracha, and honey. Add tuna cubes, green onions, and toasted sesame seeds. Toss gently to coat evenly. Refrigerate for 10 minutes to allow flavors to meld.
04 - Combine mayonnaise, sriracha, and lime juice in a small bowl. Whisk until smooth. Adjust spiciness according to preference.
05 - Divide seasoned rice evenly among four bowls. Top each with marinated tuna, avocado slices, cucumber, julienned carrot, and edamame. Drizzle with sriracha mayo. Garnish with pickled ginger, nori strips, furikake if using, and additional sesame seeds.
06 - Serve immediately, inviting diners to mix the ingredients before eating for optimal flavor balance.