Prepare the olives by removing pits if necessary and roughly chopping them.
In a large bowl, combine the chopped olives, halved cherry tomatoes, diced cucumber, and thinly sliced red onion.
Add the crumbled feta cheese and chopped fresh basil to the bowl.
In a small bowl, whisk together lemon juice, extra-virgin olive oil, salt, and black pepper to create the dressing.
Pour the dressing over the salad and gently toss to coat all ingredients evenly.
Taste and adjust seasoning if necessary, adding more salt, pepper, or lemon juice as needed.
For best flavor, allow the salad to rest for 15-20 minutes before serving.
Serve at room temperature as a side dish or light meal.