1. Rinse quinoa under cold water.
2. In a saucepan, bring water to a boil. Add quinoa, reduce heat, cover, and simmer for 15 minutes.
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 dressing over the salad and toss to combine.
7. Serve immediately or chill in the fridge for later.