In a small bowl mix together olive oil, lemon juice, salt, pepper and sumac. Whisk vigorously to combine.
In a salad bowl toss together parsley with the rest of the ingredients.
Add the olive oil mixture and toss until completely coated.
Serve immediately.
Notes
Frequently asked questions:
Can I make this salad ahead? You can make it one day ahead or to take to a picnic but do not add the dressing until ready to serve. So if you are taking this salad along, pack the parsley mixture, cheese and dressing in separate containers.
How long will it keep? I only like to serve this fresh. I have eaten some following day if I have a little left over but it is much better eaten as fresh as possible.
Can I freeze parsley salad? No, do not freeze this dish it will completely wilt the greens and tomato.