The name says it all
When a White Grapefruit and a Pomelo get married a citrus hybrid is born, bearings the name Oroblanco, but to me Sweetie sound much more sweeter.
This oval-shaped fruit has a thick green outer peel, with a cosy white inner, and white membranes separating the fleshy sweet, sweet segments. End of season, last of the last ones. See you next year Sweetie!