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The batter will be thick. The batter will now be a bit thin. No batter will stick to the surface when done.
Place first 6 ingredients into a mixing bowl and beat well, until smooth. Add 1 cup hot, strong coffee and the baking soda. Beat well. Add 2nd cup coffee and the vanilla. Beat well. Bake at 350F or 180C for 35-45 minutes, or until tests done with toothpick or sharp knife. Cool well before frosting. To make the frosting, use either a double boiler, or a heavy saucepan placed on low heat. Pour the milk into the pan and add the cocoa squares and water. Stir constantly until the mixture is smooth and creamy, about 15 minutes. Remove from heat and cool for 5 minutes. Add 2 teaspoons vanilla. Stir until smooth. Frost the cake. Finished.