Ginger and walnut carrot cake - Penguin Books New Zealand

Ingredients

• 200g plain flour
• 1 tsp baking powder
• ½ tsp bicarbonate of soda
• 2 tsp ground ginger
• ¼ tsp fine sea salt
• 175g soft light brown sugar
• 2 large eggs, at room temperature
• 200ml vegetable oil, plus more for greasing
• 200g carrots, peeled and coarsley grated
• 100g walnut pieces, roughly chopped or crumbled
• 75g crystallised ginger, finely chopped
• 100g unsalted butter, soft
• 100g icing sugar, sieved if lumpy
• 1 tsp cornflour
• 100g full-fat cream cheese, fridge-cold
• 1 tbsp fresh ginger, coarsely grated
• 25g walnut pieces, roughly chopped or crumbled
• 25g crystallised ginger, finely chopped