Valencia rice: Valencia rice (sometimes called paella rice) is Spanish-grown, short-grain rice classically used when making paella. It differs from other short-grain rice because of its ability to absorb moisture without breaking down. When fully cooked, the individual grains of rice remain whole. ‘Bomba’ is the best variety. Find it in specialty markets or online at tienda.com. Arborio rice can be used as a substitute, but yields a creamier dish.