Preheat a large nonstick or ceramic pan over medium heat until quite hot.
Season the rice: In a large mixing bowl, mix the rice with vinegar and salt. Toss gently to coat well.
Crispy rice: Add 1 tbsp oil to the pan and then the rice. Spread into a single layer and fry over medium heat until the bottom is crispy and golden, about 6 minutes. Press down with a spatula to aid crisping.
Flip the rice using a spatula, add the remaining 0.5 tbsp oil around the edge of the pan, and continue to fry and press for another 5-6 minutes. Transfer to 2 serving bowls.
Spicy sauce:
Whisk all sauce ingredients together in a bowl. Chill in the fridge to keep it cold.
Assemble the bowl:
Add the crispy rice to each bowl, add the canned tuna, edamame, carrot and cucumber ribbons, avocado slices, and Mandarin oranges.
Tuck nori sheets into each bowl.
Drizzle with bang bang sauce, extra drizzle of sriracha, and sprinkle with black sesame seeds. Serve immediately.
Video
Notes
Make-ahead: Use day-old cooked and chilled rice – it's easier to make the rice grains crispy.
Best rice: I recommend using short-grain white rice for its sticky and starchy texture.
In a hurry? No time to make crispy rice? Any cooked rice will work perfectly, too.
Extra sauce: Store any extra sauce in the fridge and use within 5-7 days.