Kumara ginger cake with white chocolate icing

Ingredients

• 500 gram kumara, peeled, chopped
• 125 gram butter, at room temperature
• 150 millilitre 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 teaspoon ground ginger
• 1 teaspoon bicarbonate of soda
• 1/2 teaspoon salt
• 1/2 teaspoon ground allspice
• Icing
• 2 tablespoon pouring cream
• 90 gram high-quality white chocolate, chopped or broken into pieces