The Collaborative International Dictionary
Granadilla \Gran`a*dil"la\, n. [Sp., dim. of granada pomegranate. See Grenade, Garnet.] (Bot.) The fruit of certain species of passion flower (esp. Passiflora quadrangularis) found in Brazil and the West Indies. It is as large as a child's head, and is a good dessert fruit. The fruit of Passiflora edulis is used for flavoring ices.
Wikipedia
Passiflora edulis is a vine species of passion flower that is native to Brazil, Paraguay and northern Argentina. Its common names include passion fruit (US), passionfruit (UK and Commonwealth), and purple granadilla (South Africa), Maracujá (Brazil) and Lilikoʻi (Hawai'i).
It is cultivated commercially in tropical and subtropical areas for its sweet, seedy fruit. The passion fruit is a pepo, a type of berry, round to oval, either yellow or dark purple at maturity, with a soft to firm, juicy interior filled with numerous seeds. The fruit is both eaten and juiced; passion fruit juice is often added to other fruit juices to enhance aroma.