Cook the quinoa according to the instructions on the packaging, and then cool slightly.
In the meantime, peel the grapefruit and, using a sharp knife, cut out the segments, collecting the juice in a bowl.
Cut the avocado in half, remove the pit, scoop out the flesh, then cut into strips and lay in the grapefruit juice.
In a bowl, mix together the cooked quinoa, sweet corn, mint, olive oil and bean sprouts.
Season with salt and pepper.
Place a handful of lettuce on a serving dish and spoon the quinoa on top.
Divide the avocado and grapefruit segments on top.
Served drizzled with the grapefruit juice and topped with pistachio nuts.