Peel the potatoes, cook them half cooked without salt and grate. Beat the egg whites of the eggs until stiff, then beat half of the sugar. Beat 4 egg yolks with the other half of the sugar. Add lemon juice, lemon zest and almonds. Finally fold in the semolina, potatoes and egg whites.
Grease a springform pan with butter and sprinkle with breadcrumbs. Pour the batter into the mold. Bake in the preheated oven at 175-180 degrees for 1.5 hours. Cover with paper if necessary.
After baking, sprinkle the cold potato cake with powdered sugar.