Peel all the prepared potatoes, wash them and cut them into pieces. Wash the onion and cut it into pieces. Clean the fresh mushrooms, then cut them into pieces and put them in a bowl. Add a spoonful of edible salt, stir well and leave for 5 minutes. After 5 minutes, we will squeeze these mushrooms hard to squeeze out the excess water inside.
Then boil the water in the pot. After the water is boiled, put the cut potato pieces into the pot and steam 15 minutes. When the potatoes are completely steamed, put them in a plate, then squeeze them hard to turn all the steamed potatoes into mashed potatoes, and then put the mashed potatoes aside to cool. Add hot oil to the pot. When the oil is hot, add onion and stir-fry until fragrant. When fragrant, add mushrooms and stir-fry them on fire. Then add the right amount of edible salt and monosodium glutamate, stir-fry for a few times, and then set aside. Next, we put the fried onions, mushrooms and mashed potatoes together and stir them evenly for later use.
Press mashed potatoes directly into cakes, and the size can be determined according to personal preference. Coat the potato cake with a layer of starch, another layer of egg liquid, and finally a layer of bread crumbs. When there is a little more oil in the pot, put the potato cake in the pot and fry it until both sides are golden. Then we squeeze some ketchup on the potato cake, so that the delicious potato avocado onion cake is ready. The potato, avocado and scallion cake made by this method is delicious and delicious, and children especially like it.