The name literally means 'toad water,' though no toad is involved — it's simply raw cane juice, ginger, and lime, and nobody agrees on how the name started.
Fresh ginger is steeped with raw cane sugar (tapa de dulce) and lime juice, then served over ice as a sharp, spicy-sweet cooler. Street vendors in Limón sell it from coolers and carts, especially in the afternoon heat.