Cook the quinoa, fluff with a fork and leave to cool for 10-15 minutes.
In a bowl, add in the quinoa, lettuce (or baby spinach), sliced beetroot and mandarin orange.
Toss together, add in the feta cheese and chopped walnuts.
To make the dressing, whisk together the vinegar, olive oil and mandarin juice until well combined.
Add some salt and pepper to taste. Drizzle over your salad and mix well.