1. Rinse the quinoa under cold water.
2. In a saucepan, bring water to a boil. Add quinoa, reduce heat, cover, and simmer for 15 minutes or until water is absorbed.
3. Remove from heat and let quinoa cool.
4. In a large mixing bowl, combine cherry tomatoes, cucumber, bell pepper, and red onion.
5. Add the cooled quinoa to the vegetables.
6. In a small bowl, whisk together olive oil, lemon juice, salt, and black pepper.
7. Pour the dressing over the salad and toss to combine.
8. Garnish with chopped parsley before serving.