Cream butter and slowly mix in sugar, beating until light and fluffy. Add eggs and vanilla, mixing well. Add chocolate and combine thoroughly. Mix flour, baking soda and salt together and add to butter mixture, mixing well. Add cold water and beat until smooth. Pour batter into 2 buttered and floured 20 cm cake pans. Bake at 180ºC until toothpick inserted in center of cake comes out clean, about 20 to 25 minutes. Cool in pans for 5 minutes, then turn out onto racks to cool completely before frosting. Source Marion Cunningham. ----