Pistachio cake

Syrup

• 330 g raw sugar
• 370 g water
• 1 tbsp honey
• 1 cinnamon quill
• 1 tsp ground cardamom
• 1 tsp dried fennel seeds
• 1 orange, zest only, no white pith

Cake

• 190 g salted butter, softened, plus extra to grease
• 280 g shelled unsalted pistachio nuts, plus an extra 2 tbsp to decorate
• 170 g raw sugar
• 1 orange, zest only, no white pith
• 3 eggs
• 60 g full cream milk
• 1 tbsp white vinegar
• 220 g self-raising flour
• 120 g plain flour
• 1 tsp baking powder