In a medium saucepan, bring the vegetable broth or water to a boil.
Once the liquid is boiling, stir in the couscous. Remove from heat, cover, and let it sit for 5 minutes until the couscous absorbs all the liquid.
Fluff the couscous with a fork and let it cool slightly.
While the couscous cools, prepare the vegetables: in a large bowl, combine the diced cucumber, cherry tomatoes, bell pepper, red onion, parsley, and mint.
In a small bowl, whisk together the lemon zest, lemon juice, olive oil, salt, and pepper until well combined.
Add the fluffed couscous to the large bowl with the vegetables and pour the lemon dressing over the top.
Gently toss everything together until well mixed. If desired, fold in feta cheese for added creaminess.
Taste and adjust seasoning if necessary, adding more salt, pepper, or lemon juice as preferred.
Notes
Serve chilled or at room temperature, garnished with additional lemon wedges and fresh herbs.