1 Grate potatoes in a food processor and then cut to make them a smaller grate. Place potatoes in a clean kitchen towel and squeeze out all juices into a bowl. 2 Allow the liquid to settle and then pour off the water and add the potato starch to the potatoes in a large bowl. Finely chop onions and add to bowl with eggs, salt and wasabi. 3 Heat large pan over high heat and once hot add potato mixture to pan in spoonfulls. Flatten wtih spatula. 4 After 3 minutes turn over if golden brown and cook other side. Remove to drain on paper towels. 5 Serve with wasabi mayonaisse.