Kumara ginger cake with white chocolate icing

Ingredients

• 500 grams kumara, peeled, chopped
• 125 grams butter, at room temperature
• 150 millilitres maple syrup
• 1/2 cup tightly packed brown sugar
• 2 eggs, at room temperature
• 1/2 teaspoon vanilla extract
• 1 3/4 cup plain flour
• 2 teaspoons ground ginger
• 1 teaspoon bicarbonate of soda
• 1/2 teaspoon salt
• 1/2 teaspoon ground allspice
• Icing
• 2 tablespoons pouring cream
• 90 grams high-quality white chocolate, chopped or broken into pieces