In a medium saucepan, bring 8 oz. (240ml) water to a boil. Remove from heat, stir in couscous, season with salt and pepper, cover, and let sit for 5 minutes.
Uncover, fluff with a fork, and let cool for another 5 more minutes.
In a small bowl or mason jar, whisk together lemon juice, 4 tbsp. olive oil, garlic, and season with salt and pepper.
In a large bowl, combine couscous, red onion, cherry tomatoes, cucumber, parsley, mint, and feta. Mix well.
Pour the dressing over the salad and toss to combine.
Taste and adjust seasoning if needed.