Grease a round 5 inch pan with butter well. Preheat our oven to 180 c or 350 F .
Melt the butter and chopped chocolate together either in the microwave or stovetop.
Take off the heat and whisk in the sugar.
Mix in the eggs, one by one.
Add in the cocoa, vanilla and water . Mix until smooth.
Pour batter into prepared pan . Bake at 180 c or 350 f for 25-30 minutes. A toothpick inserted into the centre comes out clean and dry.
Cool in pan for five minutes and unmould carefully to cool completely on wire rack.
In a saucepan , measure out the pomegranate juice , sugar and lemon juice. Bring to boil. Then lower the heat and simmer until its the thickness you want. Will take around 5-10 minutes.
Cool until needed. To serve , spoon or drizzle over slices of cake or on the side of the serving dish.