In a saucepan, bring stock to a boil.
Stir in quinoa.
Reduce heat to med low and cover.
Cook 15 minutes, until liquid is absorbed.
Transfer to a large bowl and cool.
Place all salad ingredients into a large bowl and toss to combine.
In a small bowl, whisk together olive oil, lemon juice, garlic and oregano. Pour onto salad and toss again to well combine. Taste and add salt and pepper as you'd like.
Place in refrigerator for 1 hour to marinate, or serve immediately.