If the water boiled, in the oven baking is equal to the 'second waste' water minerals will be damaged, resulting in the loss of the cake out of the effect is also poor, it is recommended that the water temperature to 70 degrees Celsius is better. As for the shape of the honeycomb well, you have to cut the cake from the center, and then put it in reverse, this time the 'surface' is not naturally honeycomb.