Grease or line two 9-inch (23 cm) cake pans or one 9 x 13-inch (23
x 33 cm) pan. Heat oven to 350 degrees F (175 degrees C).
In mixer, combine flour, sugar and salt.
Melt chocolate with butter and water Add melted chocolate mixture
to flour mixture and mix lightly. Add sour cream, vanilla extract,
baking soda and eggs and mix well for 2 minutes.
Pour batter into pans and bake until wooden pick inserted in middle
comes out clean. Bake for 30 minutes.
Cool on rack for 10 minutes and
unmold cake to cake rack to cool completely before frosting.
To make frosting: In mixer, combine confectioners' sugar, salt,
vanilla extract and milk. Melt the unsweetened chocolate and add
to confectioners' sugar mixture. Slowly add melted butter and beat
to spreading consistency.
Ice cake using about 1/2 cup (220 ml) of icing between layers.