The dish's name comes from the English phrase 'run down,' describing how the coconut milk is boiled down and reduced until it 'runs down' into a thick, rich broth.
Fish, shellfish, and root vegetables like yuca and plantain are simmered slowly in coconut milk until the broth thickens into a rich stew. Coastal cooks in Bluefields sell it by the bowl at street stalls, especially during the Palo de Mayo festival.