01 -
Preheat the oven to 175°C. Grease an 8-inch (20 cm) round cake pan with non-stick spray and line the base with parchment paper.
02 -
Zest one orange with a microplane, avoiding the white pith. Juice both oranges, reserving 120 ml of juice for the batter.
03 -
Combine flour, walnuts, baking powder, baking soda, and salt in a food processor. Process for 90 seconds until finely ground. Transfer to a separate bowl.
04 -
Add butter, sugar, and orange zest to the empty food processor. Blend for 45 seconds until creamy.
05 -
Scrape down bowl sides. Add both eggs and blend for 25 seconds, ensuring a smooth consistency.
06 -
Add half the flour mixture and blend for 10 seconds. Pour in orange juice and blend 10 seconds more. Add remaining flour mixture and blend for a final 10 seconds.
07 -
Pour batter into prepared pan, smoothing the top. Bake for 30 to 32 minutes, or until a toothpick inserted in the center emerges clean.
08 -
Set the pan on a wire rack and allow the cake to cool completely before removing from the pan and slicing to serve.