Prepare the Vegetables: In a large salad bowl, combine the chopped romaine lettuce, diced cucumbers, diced tomatoes, and thinly sliced red onion.
Add Herbs: Mix in the chopped fresh parsley and mint, giving the salad a fresh and aromatic flavor.
Season: Sprinkle the sumac over the salad. This key ingredient adds a tangy, lemony flavor that is characteristic of Middle Eastern cuisine.
Dressing: In a small bowl, whisk together the lemon juice and olive oil. This simple dressing will complement the sumac and bring the salad together.
Combine: Pour the dressing over the salad and toss everything together until well mixed. Season with salt and pepper to taste.
Serve: Serve the salad immediately, perhaps with warm pita bread on the side. The bread can be used to scoop up the salad or to enjoy any remaining dressing at the bottom of the bowl.