It's pressed to order right in front of you — vendors feed raw sugarcane stalks through a hand-cranked or motorized roller press and the juice runs straight into your cup.
Guarapo is the pale green juice extracted by crushing fresh sugarcane stalks through a roller press, served over ice, sometimes with a splash of lime. Street stands with visible cane presses are a common sight in Cuban towns, pressing juice fresh for each customer rather than pre-bottling it.