Pineapple Guava or Feijoa are originally from South America, but mainly grown in New Zealand. The pineapple guava has a dark green fruit with white flesh. Pineapple guavas are delicious eaten raw in fruit salads, but usually made into jam.
Dowell, P., Bailey, A. (1980) The Book of Ingredients, Dorling Kindersley. ISBN 0718119150.