The coca malfeta Food and drink · Onda, La Plana Baixa, Castellón Image of Onda, not of the place itself. A spongy sponge cake of irregular appearance, from which it takes its name, baked in the households for afternoon snacks and festivities; the Onda table is completed with the rice with meatballs characteristic of Christmas. Photo: Columbusalbus (CC BY-SA 4.0) What to see and do in Onda