Handle with care
Firstly, the largest duck eggs are separated from the smaller examples. The next part of the process is particularly significant and can be considered to be a large part of the 'secret' to producing them.
Locals gather soil from nearby termite hills, which is said to posses high levels of sulphate when compared with regular soil. This rich, earthy soil is then thoroughly sieved in order to remove large pieces of gravel, then mixed with water and salt into a sticky, clay-like material. Later, the salted eggs are covered with ash from burned husks. This process is widely credited with producing the eggs' distinct flavors.