A traditional approach
Chaiya, a district of the southern province, is about 68 kilometers from Muang district and takes about one hour to reach by car.
In the distant past, the only way to purchase salted duck eggs from Chaiya was to travel all the way to the district as production remained fairly limited until recently.
The preservation of duck eggs is actually fairly common across the continent, and the easiest way to preserve them was to treat them with salt before covering them in a layer of mud of clay.
Salted eggs these days are a common sight in Thailand. They're usually boiled or fried and used as a side dish, accompanying rice and other dishes. In terms of production, you can certainly say that preserved duck eggs represent another form of valuable folk wisdom. This is particularly true of salted eggs produced in Chaiya district, which are well known throughout the kingdom. Indeed, they have become a leading product under the One Tambon, One Product (OTOP) program