Nagaimo is also called 山药 or 淮山 in Chinese. It is a type of yam that can be consume raw. It has long been traditionally used as Chinese medicine and herbology. They cut it and dried it in pieces for cooking Chinese herbal soup. It's the white color herb that we called it 淮山. I just learned that it has other name which is 山药 from my Chinese friends. I learned this dessert from them as they gave me a container to try. It was my first time tasting fresh Nagaimo, frankly I didn't like it as they cut it into big chunks. It was similar to potato in taste but full of potassium, magnesium, zinc, vitamin C, vitamin B1, and more. It is also low in calories and a high protein tuber. I saw a Chinese cooking show, where they put cubed and blanched Nagaimo and Pumpkin into heated milk and serve it as breakfast. Usually you can cook it like what you would normally cook a potato dish.
You can read more about Nagaimo here. And more about the nutritional facts here.
In this dessert, I diced the Nagaimo into small cubes so that it was easier for me. Since I cooked it in a slow cooker, some of the Nagaimo was blended into the soup when stirring. It still have pieces of Nagaimo but quite pleasant since it was not in big chunks. Definitely a dessert I will be cooking if I buy Nagaimo again.