Heat oven to 180C/160C fan/gas 4. Rub the chicken with the Cajun seasoning until coated. Heat a heavy-based griddle pan over a medium heat and add the oil. Add the chicken and colour on both sides. Transfer the chicken to a baking tray and bake for 20-25 mins or until cooked.
Meanwhile, boil a saucepan of water. Rinse the quinoa under cold water, then put in the pan. Cook for 15 mins, then drain in a sieve. 3 In a food processor, add nearly all the chilli, spring onions (reserve some of each to serve), the spinach, mint and coriander, and blend to a smooth purée.
Add the purée to the quinoa and mix well. Add the remaining ingredients, except the chicken, and combine well. Season to taste. Divide the quinoa mix over 2 plates, top each with chicken and serve sprinkled with the lemon zest, sesame seeds, reserved chilli and spring onions and lime wedges, if you like.