Rinse the quinoa under running water.
Boil water in a pot, add quinoa, and cook for 15 minutes.
Drain the cooked quinoa using a sieve.
Cut vegetables such as cherry tomatoes, cucumber, and onion into bite-sized pieces.
In a bowl, mix the cooked quinoa, vegetables, olive oil, lemon juice, salt, and pepper.
Transfer to a serving dish to finish.