Steps:
1. Wash and drain the oysters, and then marinate them with proper amount of salt and raw flour 15 minutes.
2. Fresh yam is peeled and washed and then broken with a blender.
3. After the water is boiled, add ginger slices and fresh yam and stir constantly to prevent yam from sticking to the pot.
4. After boiling, add the oysters and cook until the oysters float. The logistics department adds a proper amount of salt and cooking wine to taste.
5. finally sprinkle with coriander.