01 - Rinse quinoa thoroughly under cold water using a fine-mesh strainer. Bring 2 cups of water to a boil in a medium saucepan, add the quinoa, reduce heat to low, cover, and simmer for 15 minutes until all liquid is absorbed. Fluff with a fork and allow to cool to room temperature.
02 - While the quinoa cools, whisk together the extra virgin olive oil, freshly squeezed lemon juice, Dijon mustard, minced garlic, salt, and black pepper in a small mixing bowl until emulsified.
03 - In a large salad bowl, toss together the cooled quinoa, halved cherry tomatoes, diced cucumber, diced red bell pepper, finely chopped red onion, chopped parsley, and chopped mint.
04 - Pour the prepared dressing over the salad and toss gently until all ingredients are evenly coated.
05 - Sprinkle crumbled feta cheese over the top if using, and toss lightly. Adjust salt and pepper to taste.
06 - Serve immediately at room temperature, or refrigerate for 30 minutes to allow flavors to meld before serving.