Which ingredient is NOT part of the Greek Salad?

In a traditional Greek salad, the primary ingredients typically include tomatoes, cucumbers, onion, olives, and feta cheese. Pepperoncinis may also be included for added flavor and tanginess. Chicken is not a standard ingredient in a traditional Greek salad, as this dish is generally served as a fresh, vegetable-centric salad that relies on its components for flavor and texture rather than protein sources like meat. Therefore, identifying chicken as the ingredient that does not belong to this classic salad aligns with its authentic composition, which focuses on herbs, vegetables, and cheese rather than meat.