Rinse the quinoa under cold water to remove bitterness.

Combine quinoa and water or broth in a medium saucepan, bring to a boil, then reduce heat to low and cover. Simmer for about 15 minutes until liquid is absorbed.

Remove from heat and let sit covered for 5 minutes, then fluff with a fork and spread on a baking sheet to cool.

In a small bowl, whisk together lemon juice, olive oil, salt, and pepper to make the dressing.

In a large mixing bowl, combine diced cucumbers, tomatoes, red onion, and chopped herbs.

Once quinoa is at room temperature, add it to the bowl with the vegetables.

Pour the dressing over the mixture and toss gently to combine.

Fold in feta cheese right before serving.