Spinach and cheese, so you can technically tell yourself you're eating your greens with a straight face.
Fun fact: Paneer doesn't melt because it's set with acid instead of rennet, making it structurally closer to ricotta.
No lettuce, just a thick slab of feta sitting on some tomatoes, and honestly that's all you need.
Fun fact: A traditional horiatiki never contains lettuce — just tomato, cucumber, onion, olives, and a feta slab.