Pita Gyros Apo Ola (Απ' Όλα) means the gyros "with everything," and it is the default most Greek shops build when you order a pita gyros without qualifying it. Apo ola is the baseline against which every other variant on this list is a subtraction or an addition: the full standard set, nothing left out, nothing extra requested. The angle here is what that complete set actually is and how it should be assembled, because "everything" is a fixed national grammar, not an open invitation.
The full build, in order: a warm pita griddled soft and brushed with oil; a smear of tzatziki on the bread; the carved gyros meat straight off the vertical spit; sliced tomato; raw onion; and a handful of fries, patates, tucked inside before the round is rolled into a cone and wrapped in paper. Good execution layers it so the tzatziki anchors to the bread, the hot meat sits against it, and the fries go in last so they stay crisp against the wrap rather than steaming flat. The meat should be shaved thin with crisp edges from the spit, not hacked into dry chunks; the tomato ripe, not pale and watery; the onion cut fine enough to season rather than overwhelm. Sloppy work shows as a cold pita that cracks, soggy fries buried under wet tzatziki, a flood of sauce that turns the paper to mush before you have unwrapped it, or grey reheated meat with no crust. The cone has to seal at the base so the load stays put to the last bite.
What makes apo ola worth naming is that it is the reference point: it is why every other order on this list is phrased as a change to it, horis this or me that. Ask for apo ola and you are trusting the shop's standard hand, which is the honest way to judge a gyros counter. Regional defaults shift the "everything" slightly: an Athenian build leans on tomato, onion, tzatziki, and fries, while a Thessaloniki-style round often swaps in mustard and ketchup and drops the tzatziki as its baseline. The pork or chicken gyros on the spit, and the carving technique behind it, deserve their own article rather than being crowded in here; at this entry the point is the complete set and the order it goes in.