1. Soak the sweet potato vermicelli in advance
2. Scallion ginger garlic cut into small pieces
3. Heat oil in a pot, add green onion, ginger and garlic until fragrant
4. Add chili
5. Pour in vinegar and soy sauce and stir fry
6. Finally pour in boiling water and sweet potato vermicelli
7. Boil for about 7.8 minutes, add salt and coriander to cook
Tips:Sweet potato vermicelli should not be cooked too badly
