1. Sweet potatoes are steamed, peeled and crushed into a puree
2. Toast
3. Brush a layer of liquid egg yolk on the toast
4. Then put an appropriate amount of sweet potato puree on the toast, roll it, squeeze both ends to close the mouth
5. The toast rolls are deep-fried in a frying pan and placed on absorbent paper to absorb the oil and water
6. Cut into two pieces and serve on a plate
7. Served with condensed milk
