Rinse the quinoa really well.
Combine quinoa, water and salt in saucepan.
Bring mixture to a boil, then lower the temperature and simmer with the lid on until water is absorbed. About 10-20 minutes. This can vary depending on the size of the quinoa.
Remove the lid and fluff with fork. Set aside to cool.
While quinoa is cooking; chop the red onion place in a bowl and cover with vinegar and let sit.
If corn is frozen; place a it in a bowl and run boiling water over it and let sit.
Chop the tomatoes and the peppers.
Place the last 5 ingredients in a jar and set aside.
Place the quinoa in a large bowl.
Drain the corn and the red onion and add to the bowl.
Add the peppers and tomatoes.
Shake up the dressing and pour over bowl ingredients.
Mix well and adjust seasoning.