Cook 300g of quinoa according to the packet instructions, then transfer to a bowl. Drizzle with 1 tablespoon of extra virgin olive oil and squeeze over the juice from 1 lemon, then leave aside to cool.
Meanwhile, peel and finely slice 2 cloves of garlic and finely slice 1 fresh red chilli (deseed if you like).
Drizzle ½ a tablespoon of olive oil into a non-stick frying pan on a medium heat, add the garlic, chilli, 1 teaspoon of cumin seeds and ½ a teaspoon of mustard seeds, then fry for 2 to 3 minutes, or until golden.
Add ½ a teaspoon of ground turmeric and 100g of sprouts and shoots, toss together, then fry for a further 5 minutes, or until crisp, then leave to one side.
Cut 400g of broccoli into small florets and cook in a pan of boiling water for around 5 minutes, or until cooked but still with a bit of bite. Plunge into a bowl of cold water, then drain and add to the quinoa, along with 100g of baby spinach and the crispy sprouts and shoots.
Halve and destone 1 ripe avocado, then use a teaspoon to scoop little curls of flesh all over the salad, then toss together.
Place a griddle pan on a high heat.
Finely slice the remaining lemon into rounds, then drizzle the mackerel with olive oil, season with sea salt and black pepper, then stuff with the lemon slices and 1 bunch of mixed soft herbs (30g), reserving a a few sprigs for the salad.
Grill the mackerel for 4 to 5 minutes on each side, or until bar-marked and beautifully crisp.
Finely chop the reserved herbs and scatter over the quinoa salad, then serve alongside the crispy mackerel.