Salad assembly: For this salad, it's ideal to keep ingredients separate to avoid sogginess. That could mean placing each chopped ingredient in separate jars or containers or using a divided container to store ingredients without them mixing. This is for the greens, tomato, cucumber, onion and radishes. The parsley and scallions can be kept in the same container.
Make the dressing: add all of the dressing ingredients to a food processor or blender. Blend/process well, taste and add more salt if desired. Store the dressing in its own container.
Before eating: toast the pita bread in the toaster, on the stove or in the oven and tear/chop it up. Add greens, cucumber, radish, red onion, tomato, scallions, parsley, the toasted pita and about 1/2 tsp sumac to your salad and mix. Top with the dressing (you may need to give it a shake) and any proteins if using. Enjoy!