Kue Jeruk Sisilia

Bahan-bahan (10 porsi)

• 250 g unsalted butter (room temperature)
• 250 g castor sugar (or reduced to 200 g)
• 4 medium eggs (or 3 large eggs)
• 2 g rated oranges zest
• 270 g self raising flour
• 120 ml freshly squeezed orange juice
• ½ teaspoon rum (optional)