It was traditionally made at olive-harvest time, when fresh olive oil was plentiful enough to soak every layer of dough.
Layers of dough, often flecked with sesame and nigella seeds, are packed with chicken and a heap of onions cooked down in olive oil, baked into a dense, oil-rich pie, then sliced into wedges. It's most associated with the Irbid governorate, where households and small bakeries make it for gatherings rather than everyday sale.