To make the crusts: pulse coconut and walnuts together in your food processor until they become crumbs. Add the rest of the ingredients and process until it stick together. Press into tart tins lined with coconut oil and put in the fridge to set for about an hour. Take them out of the molds and fill with mango slices, dusting the tops with cinnamon and ginger and sprinkling with coconut. Enjoy!