The macadamia nut is the most expensive nut in the world, with the hardest shell to crack. These exotic nuts are full of quality protein and have a rich, buttery flavor—making them ubiquitous in both the snack aisle and on dessert menus. Macadamia nuts are the fruits produced by macadamia trees, a species of evergreen trees indigenous to Australia. Macadamia nuts have other names in different parts of the world: they are also known as the Queensland nut; bush nut; maroochi nut; bauple nut; and Hawaii nut.