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.
Two treats from one Annabel Langbein recipe. Simply simmer whole quinces in a sugar syrup till tender, then make a glorious ruby jelly from the syrup and a delicious quince paste from the poached fruit.