1. After steaming, drying in the sun and then frying: This technology can make the surface of iron stick yam yellowish, fragrant and delicious.

2. Direct sun-drying: This technology can keep the original shape and taste of the iron stick yam, and at the same time, it can also keep the nutrients in it better.

3. Drying after steaming: This process can make the iron stick yam easier to preserve, and at the same time, it can keep its original nutritional components.