Beat the butter, sugar, eggs, flour, baking powder, salt, soda, cinnamon, nutmeg, cloves and grated zest of two oranges with a mixer. Add the grated carrots and zucchini through a medium grater and mix well.
Lubricate the mold with a diameter of 23 cm and place the dough there. Bake at 180 ° C for about 30 minutes. Check the readiness with a toothpick: it should come out of the center of the cake clean.
Mix the powdered sugar and 2-3 tablespoons of orange juice. Pour the resulting glaze lightly cooled cake and sprinkle with the peeled peel of the remaining orange. Before serving, allow the glaze to freeze.