Rinse the quinoa under cold water.

In a pot, combine quinoa and water. Bring to a boil, then reduce heat and simmer for 15 minutes.

Remove from heat and let it sit covered for 5 minutes, then fluff with a fork.

In a mixing bowl, combine the cooked quinoa, cherry tomatoes, cucumber, red onion, and parsley.

Drizzle with lemon juice and olive oil, then season with salt and pepper to taste. Mix well.