Preheat the oven to 220°C (425°F) (200°C/400°F fan-forced).
Add the cooked and cooled rice to a baking tray lined with baking (parchment) paper. Drizzle over the tamari, dark soy sauce (if using), sesame oil and olive oil. Use a spoon (or your hands) to toss the rice so that it is evenly coated. Spread the rice out on the baking tray as evenly as possible in a thin layer.
Bake for 40–50 minutes, checking and stirring the rice every 15 minutes to ensure even browning.
Add the dressing ingredients to a medium bowl, whisk to combine and set aside.
Add the tuna, cucumber, edamame beans, avocado, spring onion and crispy rice to a large bowl.
Drizzle over the dressing. Sprinkle with sesame seeds, chilli crisp or oil and jalapeños (if using).
Toss the salad at the table right before serving.
