In a medium saucepan, bring the vegetable broth to a boil. Add the couscous, stir, and remove the saucepan from the heat. Cover and let it sit for about 5 minutes until the couscous has absorbed all the liquid.
Fluff the couscous with a fork and let it cool to room temperature.
Meanwhile, prepare the vegetables: in a large mixing bowl, combine the diced cucumber, halved cherry tomatoes, chopped red onion, diced bell pepper, chopped parsley, and mint.
In a small bowl, whisk together the lemon juice, lemon zest, olive oil, salt, and pepper to create a dressing.
Once the couscous has cooled, add it to the bowl with the vegetables. Pour the lemon dressing over the salad and gently toss everything together until well combined.
Adjust seasoning with additional salt and pepper if desired. If using, sprinkle crumbled feta cheese on top before serving.
Notes
Optional: Add crumbled feta cheese for extra flavor.