Preheat the oven to 300 degrees F.
Line the pan with a parchment paper and spray oil over it. Set aside.
Melt the sugar and the water in a pan. Meantime cut the chocolate.
Then add the chocolate in the water slowly stirring continually. Blend the mixture until silky upon the fire.
Chocolate for glaze should be bitter (cacao 70%) because the cake itself is very sweet already.