The Labneh Sandwich (ساندويش لبنة) is the canonical form of this whole family: strained yogurt spread on bread, finished with olive oil and usually mint or za'atar, rolled or folded to carry. It is the base case the cucumber, za'atar, and preserved-ball versions all build from, and it is the one everything else is measured against. The angle is the labneh itself and the restraint around it. Labneh is yogurt drained until it is thick, tangy, and spreadable, sitting between cheese and cream, and with so few additions the quality of the dairy and the oil decide the sandwich. A fresh, well-salted labneh under a grassy, fragrant oil reads clean, rounded, and satisfying; a flat or over-sour labneh under a thin oil reads dull and tight with nothing to lift it.
The build is short and the proportions are everything. Thick labneh is spread across split khubz or pita in a real layer, enough to taste and to hold the other elements, not a token smear. A deliberate pour of good olive oil goes over the top so it works into the surface rather than just sitting on it. Then the light finishing touches that define the everyday version: fresh or dried mint, a scatter of za'atar, sometimes sliced tomato, cucumber, or olives, occasionally a little garlic worked into the labneh. The bread is rolled or folded tight so the spread does not escape. Good execution shows labneh thick enough to hold its shape and properly tangy, a volume of oil the bread absorbs, and a clean balance where the herb or za'atar lifts the dairy without burying it. Sloppy execution thins the labneh until it weeps and slides, skimps on oil so the spread is dry and dense, or piles on so many additions that the labneh stops being the point.
It varies by what is added to or around the core, and each main move is a recognized form in its own right. Cucumber folded in makes it cooler and crisper; za'atar dusted on makes it sharper and more herbal; firmer drained labneh rolled into oil-cured balls is a denser, more intense reading. The carrier matters too: a plated spread eaten with torn bread is a leisurely meze, while the tight roll is the quick handheld breakfast or snack. Those cucumber, za'atar, and preserved forms each deserve their own treatment rather than a footnote here, and they all return to the same idea: thick tangy yogurt and good oil in bread, judged on whether the dairy was fresh and the proportions held.