Mix the egg yolks with the sugar until frothy. Stir in the grated carrots. Then add the flour, almonds, cinnamon, lemon zest and baking powder. Beat the egg white until firm and fold into the cake mixture. Pour into a springform pan (22 cm) that has been lined with fat and breadcrumbs. Bake for about 1 hour at 160 ° C fan oven. After cooling, sprinkle with powdered sugar.