Native to southern Brazil and nearby regions of South America, the feijoa has been naturalized in warmer climes in North America, Europe, and Asia. This Dadmali brand jam (360 g.; $3.29) was imported from Azerbaijan. Compared with the ripe fruit pictured on the label, the jam has the color of Fig Newton filling, and the same grainy consistency; the flavor suggests two of the feijoa's other common names, pineapple guava and guavasteen.
In this form it's best spread on toast, but if I find them fresh (was that them, at Manhattan Fruit Exchange, in Chelsea Market?), I'll consult this guide on "How to Eat a Feijoa," by a Kiwi.
Coney Island Farms
2896 West 12th St. (Surf-Neptune Aves.), Coney Island, Brooklyn
718-265-0404