Grate the boiled, peeled potatoes into a large bowl. Add the cornflour and mix well. Knead until the mixture forms a smooth, soft dough.
Divide the dough into equal portions and roll each one into a small, table-tennis-sized ball.
Bring a pan of water to a boil and add 1 tbsp of oil. Carefully add the potato balls and cook for 7–8 minutes, until they’re tender. Remove and set aside.
Heat 2 tbsp of oil in a separate pan. Add the grated garlic and sauté until lightly golden.
Add the boiled potato balls and gently mix them with the garlic oil until they’re well coated.
Add salt, chilli flakes, and soy sauce. Cook for another 1–2 minutes, gently mixing so the balls are well coated with the sauce.
Add the chopped coriander and mix everything together once more.
Put them in a serving bowl, sprinkle some sesame seeds on top, and serve hot.