1. The yam is peeled and cut into sections, put in a steamer, and steamed for 20 minutes.
2. Take out and pound it into yam puree with a rolling pin, add condensed milk and sugar and mix well.
3. To form a ball, use a fork to make a small hill.
4. Take an appropriate amount of blueberry jam. Add a little cool boiled water and stir evenly.
5. Just pour it on the yam puree, and it will taste better after putting it in the refrigerator for two hours.
