Ingredients：
Sweet potatoes	270g
Chestnuts	100g
Flour	250g
Water	260ml
Oil	3 tsps
Salt	1.5tsps
Sprint onion, coriander pepper	As desired

Method:

1. Peel the sweet potatoes and shred into thick strips.
2. Peel the chestnuts, steam until soft then dice.
3. Mix the flour with water into a thick paste.
4. Add sweet potatoes, chestnuts, coriander and spring onion into the mixture.
5. Add salt and pepper for seasoning.
6. Heat oil in a frying pan and pan-fry the sweet potato cakes until golden brown. 

Tips：

• Sweet potato is rich in water-soluble potassium. Therefore, steaming, baking and pan frying can preserve about twice the amount of potassium compared to boiling.
• We can use purple sweet potato as it contains the same nutrients as yellow ones as well as anthocyanin, which is good for eyes and lowering blood pressure.