Wash the sweet potatoes (it is best to buy red heart sweet potatoes, it is not recommended to choose white heart,because white heart sweet potato haa rougher flesh and a hard texture, the taste is not good after drying)
Wash the sweet potatoes in a steamer and steam them over high heat.
Steam for about 25 to 30 minutes. In the process of steaming sweet potatoes, you can pierce them with chopsticks to see if they are already cooked, and if the chopsticks can easily penetrate them, it means they are already steamed. Be careful not to steam for too long, just steamed through, so that the sweet potatoes won’t be too dry or mushy.
Peel off the skin of the steamed sweet potatoes and cut them into thick slices (It is not recommended to cut the sweet potatoes too thin. If they are cut into too small pieces, they are prone to deformation and spoilage during the drying process. And it will also affect the quality and taste of yam. So I cut directly into thick triangular slices, when I was a child, I watched my grandmother dry sweet potatoes, which were cut like this.
Put the thickly sliced sweet potatoes in the sun to dry. If there is no more sun, take them back inside.
After four days of drying, the sweet potatoes are quite dry. (The temperature here is about 8-9 degrees during the day and they has been dry for four days).
Then put the chinese dried yam into a steamer and steam them over high heat for about 10 minutes.
Leave the steamed sweet potatoes in the air for another day and the skins will be dry. At this point, you can collect the sweet potatoes and put them in a clean and sealable plastic bag. The sweet potatoes are done. Isn’t it quite simple? When they are soft, take them whenever you want to eat them. The dried yam at this point are guaranteed to taste much better than the dry ones, they are soft and chewy at the same time.