Whole orange cake with spiced syrup

Whole orange cake

• 200 g unsalted butter, cut into pieces, plus extra for greasing
• 1 orange, washed, unpeeled and cut into quarters
• 3 eggs
• 200 g Rapadura sugar
• 300 g self-raising flour
• 20 g orange juice

Spiced syrup

• 160 g water
• 180 g Rapadura sugar
• 2 tsp honey
• 1 cinnamon quill
• ½ tsp ground cardamom
• ½ tsp fennel seeds
• 1 star anise
• 1 orange, zest only, no white pith