
Pine nuts
Pine nuts are the edible seeds of pine trees (family Pinaceae, genus Pinus). About 20 species of pine produce seeds large enough to be worth harvesting; in other pines the seeds are also edible, but are too small to be of value as a human food.
Some people think pine nuts taste fabulous but they're also fabulously expensive. Harvesting pine nuts takes a great deal of work [1] so unless scientists come up with robots to do the work pine nuts will stay expensive.
Pine nuts contain a great deal of different types of fat [2] but at least one source says the fat in pine nuts is good. [3]