Prepare the Oranges
Wash and zest one orange.
Squeeze the juice from all three oranges and set aside.
Make the Batter
In a bowl, whisk the egg, sugar, vanilla sugar, and salt until light and fluffy.
Add the sunflower oil, yogurt, and orange juice. Stir until combined.
Sift in the flour and baking powder, mixing gently until smooth.
Fold in the orange zest for extra flavor.
Bake the Cake
Preheat the oven to 180°C (350°F).
Grease a cake pan or line it with parchment paper.
Pour the batter into the pan and bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
Glaze and Garnish
While the cake is still warm, brush the top with apricot jam for a glossy finish.
Sprinkle with grated coconut and garnish with mint leaves if desired.
Serve and Enjoy
Let the cake cool slightly before slicing.
Serve warm or at room temperature with tea, coffee, or fresh fruit.