In a medium saucepan, combine the rinsed quinoa and vegetable broth (or water). Bring to a boil over high heat.
Once boiling, reduce the heat to low, cover, and let simmer for 15-20 minutes, or until the quinoa is fluffy and the liquid has been absorbed. Remove from heat and let it sit covered for 5 minutes.
Fluff the quinoa with a fork and transfer it to a large mixing bowl to cool.
Meanwhile, prepare the vegetables. In a small bowl, combine the cherry tomatoes, cucumber, red onion, parsley, mint, and feta cheese (if using).
In a separate bowl, whisk together olive oil, lemon juice, lemon zest, salt, and pepper to create the dressing.
Once the quinoa has cooled to room temperature, add the vegetable mixture to the quinoa bowl. Pour the dressing over the salad.
Gently toss everything together until combined and adjust seasoning with more salt and pepper if needed.
Chill in the refrigerator for at least 30 minutes before serving to allow the flavors to meld.
Notes
Chill in the refrigerator for at least 30 minutes before serving to enhance the flavors.