2. In a saucepan, combine lentils and water. Bring to a boil, then reduce heat and simmer for 20 minutes or until lentils are tender. Drain and let cool.
3. In a mixing bowl, combine cooked lentils, cherry tomatoes, cucumber, and red onion.
4. In a small bowl, whisk together olive oil, lemon juice, salt, and black pepper. Pour over the lentil mixture and toss to coat.
5. Gently fold in feta cheese and parsley. Serve immediately or refrigerate for later.