1. Rinse the quinoa under cold water.
2. In a saucepan, bring water to a boil. Add quinoa, reduce heat to low, cover, and simmer for 15 minutes or until water is absorbed.
3. Remove from heat and let it sit, covered, for 5 minutes. Fluff with a fork.
4. In a large mixing bowl, combine cooked quinoa, cherry tomatoes, cucumber, red onion, and parsley.
5. In a small bowl, whisk together olive oil, lemon juice, salt, and black pepper.
6. Pour the dressing over the quinoa salad and toss to combine.
7. Serve immediately or chill in the refrigerator for later.