Steps
1. In a bowl, combine the diced cucumber and cooked quinoa.
2. In a small bowl, whisk together olive oil, lemon juice, salt, and pepper to create the vinaigrette.
3. Pour the vinaigrette over the cucumber and quinoa mixture.
4. Add chopped parsley or mint and cherry tomatoes if using, then toss gently to combine.
5. Serve immediately or let it chill in the refrigerator for 10 minutes for flavors to meld.