Cook quinoa based on directions on the box. Set aside.
Thinly slice onions. In a skillet roast onions until they are caramelized. Add chopped red and green peppers. Stir them on medium heat for 2 minutes. Add water, cover the skillet and let it simmer until peppers are tender.
In a bowl combine all ingredients. Adding salt and pepper to taste. Transfer into a serving dish.
You can also serve this hot as a pilaf accompanying a main dish.