The oldest bar serving it, tucked into a doorway near Rossio Square, has poured the same recipe since 1840 and is still run by descendants of its founder.
Sour Portuguese cherries are steeped for months in aguardente with sugar and cinnamon, then served as a small shot, often with a boozy cherry dropped in the glass. Sold standing-room-only from narrow storefront bars around central Lisbon.