Rinse the quinoa in cold water using a sieve. Then place the quinoa in a saucepan with the vegetable stock. Cook, simmering for about 15 minutes until soft then drain and allow it to cool.
While the quinoa is cooking in a large bowl mix the cucumber, red pepper, red onion, and flat leaf parsley together. In a smaller glass Pyrex bowl whisk the olive oil, red wine vinegar and lemon juice together well. Season to taste with the salt and pepper.
Once the quinoa has cooled add it to the large bowl with the diced salad, pour the dressing on top and mix thoroughly. Check again for seasoning.
The salad is ready to eat once combined well, but I prefer to refrigerate it overnight to allow the dressing to marinate through.