1. The potatoes are peeled and cut into pieces and steamed in a pot.
2. Finely dice onion and ham.
3. Put a small amount of butter in the pan to melt.
4. Add the onion and saute until fragrant, then add the ham and stir fry together, and serve.
5. The potatoes are crushed into mashed potatoes with a spoon.
6. Add the fried onions and ham to the mashed potatoes, season with salt and black pepper. Don't be too salty, because the sauce is also salty.
7. Spread the stirred mashed potatoes on the seaweed.
8. Roll into a roll, use a little force when rolling, so that the potato rolls are more porcelain.
9. Cut into chunks.
10. Stir the egg mixture with starch.
11. Fry the potato cake in a pan with egg mixture until golden on both sides.
12. In a separate pot, add oyster sauce and water starch and stir-fry until a thick sauce is poured on the potato cakes.
