01 - Rinse quinoa under cold water. In a medium saucepan, combine quinoa and water. Bring to a boil, then reduce heat to low, cover, and simmer for 12 to 15 minutes until tender and water is absorbed. Remove from heat, let stand covered for 5 minutes, then fluff with a fork and cool to room temperature.
02 - In a large bowl, mix cooled quinoa with diced cucumber, cherry tomatoes, red onion, olives, parsley, and mint if using.
03 - Whisk together olive oil, lemon juice, garlic, oregano, salt, and black pepper in a small bowl or jar until emulsified.
04 - Pour dressing over the quinoa mixture and toss gently to coat evenly.
05 - Gently fold in crumbled feta cheese, taste, and adjust seasoning if necessary.
06 - Serve immediately or refrigerate at least 30 minutes to let flavors meld before serving.