Place the wok over a medium to high heat. Add the sesame oil.
Add the peppers and three-quarters of the spring onions, and stir-fry for 3 minutes. Then add the sweetcorn and garlic granules, and cook for a further minute.
Reduce the heat a little, then stir in the soy sauce, sriracha, and lime juice — until well combined.
Squeeze the rice pouch to separate the grains, then empty into the pan, and stir for 2 minutes — until everything is well coated and piping hot.
Add the tuna and stir gently, until thoroughly heated. Then sprinkle over the remaining spring onions and serve with an extra drizzle of sriracha if you like!