Learn how to grow feijoa in this article. If you live in a cold temperate or subtropical climate growing feijoa (Pineapple Guava) is really easy for you.
If I ever find a "Pineapple Guava". Pineapple guava, also called feijoa, is a fruit that adds a sweet-tart-floral flavor to foods like this quick bread. The glaze adds a bit of sweetness to each slice, but it's good without the glaze too.
Feijoa Pineapple Guava Info: Tips On Growing Feijoa Fruit Trees in Fruits, Edible Gardens