01 - Rinse sushi rice under cold water until the water runs clear. Combine rice and water in a saucepan, bring to a boil, then cover and simmer on low heat for 10 minutes. Remove from heat and let stand, covered, for 10 minutes.
02 - In a small bowl, mix rice vinegar, sugar, and salt. Gently fold this mixture into the cooked rice and allow it to cool slightly.
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.
04 - Combine mayonnaise, sriracha, and lime juice in a small bowl. Whisk until smooth, adjusting spiciness according to preference.
05 - Divide the seasoned sushi rice among 4 bowls. Top each with marinated tuna, sliced avocado, cucumber, julienned carrot, and cooked edamame. Drizzle with sriracha mayo, then add pickled ginger, nori strips, furikake (if using), and sprinkle with extra sesame seeds.
06 - Serve immediately, allowing each diner to mix ingredients to taste.