1) Wash the potatoes (don't peel them). On the surface of the skins, cut a cross (about 1 mm deep) with a knife.
2) Put it into a pot, pour in water and cook for 20 minutes. To be able to easily insert a chopstick means that it is ripe.
3) Cut bacon and onion into small pieces. Pour a small amount of olive oil into the pot, and heat it to 40% over high heat,
4) Put in the chopped bacon, change to medium heat, stir fry the oil, put in the chopped onion and continue to stir fry the flavor, wait until the onion is transparent, turn off the heat, and then put out.
5) Peel the cooked potatoes, put them into a bowl, and press them into mashed potatoes with a potato press (or a big spoon) until there are no granules.
6) Put the chopped bacon and onion into the mashed potato, add salt and black pepper, stir well.
7) Pour a little olive oil into the palm of your hand (so that the mashed potatoes are sticky), take a piece of mashed potatoes the size of a big ball and put it into your hand, knead it first, and then press it into small cakes one by one.
8) Pour olive oil into the pot and heat it over high heat. When the oil is 7% hot, put the potato cake into medium heat, fry one side into golden yellow, turn over, and then fry the other side into golden yellow.