To prepare the potato, spinach, and radicchio cakes, first boil the potatoes starting from cold salted water for about 30-40 minutes or until tender (1). Meanwhile, prepare the filling: clean the ...

In a medium saucepan, cover the potatoes with water. Simmer over moderately high heat until tender, about 30 minutes. Drain and let cool. Peel the potatoes and cut them into 1/4-inch dice. Transfer to ...