Put the quinoa in a pan of boiling water and simmer for about 18 mins until the grains burst. Tip into a sieve and rinse under cold water.

Meanwhile, scoop the avocado into a bowl and add the garlic, mustard and 2 tbsp lemon juice, then blitz with a hand blender or in a food processor until smooth. Add 1-2 tbsp cold water if it's too thick.

Stir the lemon zest into the quinoa, along with the corn, salad vegetables, mint and pumpkin seeds, then flavour with a little more lemon juice. Tip onto plates or into containers. Top with the chicken, if using, and spoon over the avocado mayo.