Prepare the vegetables: Cut the tomato into thin wedges and shred the romaine lettuce leaves.
Combine the salad: In a medium-sized bowl, add the shredded lettuce, tomato wedges, and cucumber slices.
Toss gently to combine.
Dress and season: Add the crumbled feta cheese, chopped olives, and extra-virgin olive oil to the bowl.
Toss again until everything is lightly coated.
Season with a pinch of salt and freshly cracked black pepper.
Assemble and serve: Carefully cut the pita pocket in half.
Stuff each pita half with the Greek salad mixture and enjoy immediately.