1. Steam the purple sweet potato, peel it and mash it into a puree.
2. Steam the sweet potatoes, peel them and mash them into a puree.
3. Beat the eggs and add a teaspoon of flour to make an egg paste.
4. The mashed purple potato and the mashed sweet potato are crushed into small balls.
5. Take two biscuits, put the purple potato mash and the sweet potato mash, and shape them.
6. Hang a layer of egg batter.
7. Fry it in the oil pan until golden and crust, and the oil temperature should not be too high.
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