Macadamia nuts have an extremely hard shell that is very difficult to open and are best suited for tropical birds such as Macaws. It belongs to the Proteaceae family and is the fruit of the evergreen macadamia tree.
That the Ministry of Agriculture initiated the planting of its seedlings by small-scale farmers mainly in the Eastern and Central Provinces of Kenya.

Anything Nature so reverently protects surely must have something very special inside! An ordinary nutcracker will not open them. Specially manufactured Mac Nut Crackers are available, but a vice grip, a hammer, and some patience will work.

The author sources the nuts from Embu, Thika, and Meru amongst other regions. Macadamia farming offers an important source of income for producers and smallholder farmers in Kenya. Kenya is currently the third top macadamia producer, with a global market share of 13 percent.

The shells are really hard and need special care during braking so as to not injure yourself.

Regular nutcrackers will not open macadamia nuts in the shell, and may even break. You must use a nutcracker specifically designed for macadamia nuts.

You can also freeze in shell macadamias but you should only pull out what you intend to use immediately.
Because moisture will form as they thaw which can ultimately lead to the rotting of the nut.