Bring the stock to the boil in a saucepan, add the quinoa and simmer for 10 - 12 minutes, or until the germs separate from the seeds.
Drain off stock and discard, then spoon the quinoa into a salad bowl and leave to cool.
Grate the rind from two of the oranges and put it in a jam jar.
Cut a slice off the top and bottom of each of the three oranges, then remove the peel in thin vertical slices and discard.
Cut between the membranes to remove the orange segments, then squeeze the juice from the membranes into the jam jar.
Add the orange segments, fennel slices, spring onions and parsley to the quinoa.
To make the dressing, add the lemon juice and oil to the jam jar, season with pepper to taste, screw on the lid and shake well.
Drizzle over the salad and toss together.
Garnish with the fennel fronds and serve immediately.