01 - In a medium saucepan, combine quinoa, water, and a pinch of salt. Bring to a boil over medium-high heat, then reduce heat to low, cover, and simmer until the water is absorbed and the grains are tender, about 12 to 15 minutes. Fluff gently with a fork and allow to cool slightly.
02 - In a small mixing bowl or jar, whisk together extra-virgin olive oil, fresh lemon juice, Dijon mustard, minced garlic, salt, and black pepper until the mixture is creamy and emulsified.
03 - Add cooled quinoa, diced cucumber, quartered cherry tomatoes, finely chopped red onion, chopped mint, and chopped parsley to a large mixing bowl.
04 - Pour the prepared dressing over the salad ingredients and toss gently until all components are evenly coated.
05 - Sprinkle crumbled feta cheese evenly over the salad. Serve chilled or at room temperature.