Step 1

Preheat oven to 150C.

Step 2

Cake: Heat butter, sugar, chocolate and water in a saucepan and stir over low heat until well combined.

Step 3

Sift both flours together and blend into chocolate mixture.

Step 4

Stir in eggs, sour cream and vanilla.

Step 5

Pour the mixture into a deep 20cm pan and cook for approximately 1-2 hours depending on your oven.

Step 6

Icing: Cream together the butter and icing sugar, then add melted chocolate.

Step 7

Spread icing over the cake.