In a large bowl, combine onion, lemon juice, and oil and season with salt and pepper. Toss well to combine and let sit 5 minutes. Add cucumber, tomatoes, feta, chickpeas, olives, and parsley; season with salt and pepper and toss to combine. Divide among four bowls and serve immediately.
This recipe is super easy and very adaptable. I totally forgot about the olives but they weren't missed much. I used the juice from a whole lemon and didn't add any olive oil. The creamy, salty feta cut the tartness of the lemon juice while keeping that fresh flavor. I also added a zucchini cut up slightly smaller than the cucumber pieces. Excited to make it again.