Oro Blancos are a cross between a white grapefruit and an acidless pummelo. Early in the season they can be readily identified by their bright green exterior. With this variety, green is good. As the season progresses, green turns to golden yellow. In either case the Oro Blanco is ripe, sweet, and ready to eat. Oro Blancos are as big or bigger than a medium sized grapefruit, generally round to flat round, with a slightly thicker rind than a grapefruit. The most notable characteristic of an Oro Blanco is the flavor. It eats sweet and the flesh lacks the bitterness sometimes associated with grapefruit. Those that have sampled them describe the flavor as a grapefruit with the sugar already added. Oro Blancos are available from the end of October to mid June.