Wash orange hot and rub half of the peel. Use the rest of the orange for other purposes. Mix butter, sugar, honey, oil, orange peel and chestnut cream with the whisk of the hand mixer.
Stir in eggs one by one and season the dough with a little nutmeg. Mix flour and baking powder and stir in.
Roughly chop the walnuts. Fold about 2/3 of the walnuts into the dough. Pour the dough into a greased and floured springform pan (24 cm Ø), sprinkle with the remaining walnuts and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see
manufacturer) bake for 30-40 minutes (chopstick sample).
Take the cake out of the oven, sprinkle with liqueur. Remove from the mould and let it cool on a cake rack.