1Preheat oven to 360°F.
2Grease a cake pan with butter and flour.
4Grind the hazelnuts for a few seconds in a Thermomix at speed 5-7, until they have turned to powder.
6Weigh the zucchini, then peel and cut into small pieces.
7Chop briefly on speed 4.
8Repeat, if necessary.
10Rinse and dry the grinder.
11Place the sugar in, increasing from speed 5-10 for about 30 seconds.
12Add the butter and set for 2.5 minutes, at speed 3.5.
13Set for 3 minutes at speed 3 and add 1 egg every minute.
14At the last minute, add the vanilla extract and the milk.
15Add the flour, baking powder, baking soda, cinnamon, salt and ground hazelnuts.
16Set for 2 minutes, speed 3.5.
17Finally, add the zucchini and mix for a few seconds, speed 3.
18Place it in the the cake pan and bake in preheated oven for about 45 minutes.
19Perform a toothpick test to be sure that it's done. Once done, remove it from the oven, remove the cake from the pan and let it cool.