1. Rinse the quinoa under cold water.
2. In a saucepan, bring the water to a boil. Add the quinoa, reduce heat to low, 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 the cooked quinoa, cucumber, bell pepper, red onion, parsley, and mint.
5. In a small bowl, whisk together the olive oil, lemon juice, salt, and black pepper.
6. Pour the dressing over the salad and toss to combine.
7. Serve chilled or at room temperature.