Rinse the quinoa under cold water until it runs clear.
In a pot, bring 300ml of water to a boil. Add quinoa and a pinch of salt, then reduce to a simmer and cover. Cook for about 15 minutes or until the water is absorbed and quinoa is fluffy.
While the quinoa is cooking, chop cherry tomatoes, cucumber, and red onion into small pieces.
In a large bowl, combine the chopped vegetables, olives, and crumbled feta cheese.
In a small bowl, whisk together lemon juice, olive oil, salt, and pepper to create the dressing.
Once the quinoa is cooked, let it cool for a few minutes, then add it to the vegetable mixture.
Pour the dressing over the salad and mix gently until everything is well combined.