1⁄4 l Bring water and cinnamon sticks to the boil in a pot and simmer for about 5 minutes. Remove from the heat and pour through a sieve. Measure 60 ml and let it cool down. In the meantime, wash the orange hot, dab dry and finely grate the peel.
Grease a springform pan (26 cm Ø) and dust with flour. Preheat the oven (electric cooker: 175°C/circulating air: 150 °C/gas: see manufacturer). Mix oil, sugar, petimezi, cinnamon water, orange peel and orange juice in a bowl with a whisk.
Mix flour and baking powder. Gradually stir in with the whisks of the mixer.
Put the dough into the springform pan and smooth it down. Bake in a hot oven for about 35 minutes. Let it cool down. Roughly chop the walnuts. Remove the cake from the tin, dust thickly with icing sugar and sprinkle with nuts.