Mini Jamaican style ginger bundts

Name: Mini Jamaican style ginger bundts
Prep time: 10 min
Cook time: 25 min
Total time: 25 min
Yield: 6 portions
Ingredients: 20 g crystallised ginger; 65 g unsalted butter; 65 g dark brown sugar; 70 g golden syrup; 50 g treacle; 125 g self-raising flour; ½ tbsp ground ginger; ½ tsp ground cinnamon; ½ tsp mixed spice; ½ tsp bicarbonate of soda; 1 pinch sea salt; 120 g full cream milk; 1 egg; 2 tbsp boiling water; icing sugar