Preheat the oven to 375 degree F.
Place the pita bread in a single layer on a sheet pan. Toss with 1 tablespoon olive oil, and half the sumac, salt & pepper. Bake 15-18 minutes until golden brown and toasted.
Remove the fava beans and peas from their pods. Discard the pods and keep the fava beans and peas separated.
In a large saucepan, cook the fava beans in boiling salted water for 3-4 minutes until tender. Using a slotted spoon, transfer them to a medium bowl of ice water. Once the fava beans have cooled, remove their skins.
In the same saucepan of boiling salted water, cook the peas for 2 minutes until tender. Using a slotted spoon, transfer them to a small bowl of ice water to cool.
In a large bowl, combine the fava beans, peas, scallions, baby spinach & arugula and parsley.
In a small bowl, whisk together the lemon juice with the remaining olive oil, sumac, salt and pepper. Toss the vinaigrette and lemon zest into the bowl with fava bean-pea mixture. Add the toasted pita bread. Season to taste.