Ingredients

• 1 cup (200 grams) sugar
  
• zest of 3 large organic oranges
  
• ¹/₄ cup (50 grams) butter, softened
  
• 3 large eggs
  
• a splash of rum
  
• 2 cups (250 grams) flour
  
• 2 teaspoons baking powder
  
• freshly squeezed juice of about 4 to 5 oranges
  
• 2 tablespoons sugar (or according to taste)
  
• Confectioners' sugar, for dusting