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 quinoa cool.
4. In a large mixing bowl, combine quinoa, kale, cherry tomatoes, red onion, and feta cheese.
5. In a small bowl, whisk together olive oil, lemon juice, salt, and black pepper.
6. Pour dressing over salad and toss to combine.
7. Serve immediately or refrigerate for later.