Spiced pumpkin, olive oil and orange cake recipe

Ingredients

• 250 g icing sugar
• 1/2 organic or unwaxed orange (finely grated zest)
• 2 tbsp orange juice
• 1 tsp lemon juice
• 1 handful unsalted pistachio nibs, to serve
• 200 g caster sugar
• 50 ml extra virgin olive oil
• 3 eggs
• 200 g plain flour
• 1 1/2 tsp baking powder
• 1/2 tsp bicarbonate of soda
• 1/2 tsp ground cinnamon
• 1/2 tsp ground allspice
• 1/2 tsp ground ginger
• 1 pinch gound cloves
• 0.2 tsp sea salt
• 250 g cooked pumpkin purée, canned or home-made (see recipe introduction)
• 150 ml light olive oil, plus more for the tin