1Cream shortening and sugar. Add eggs and beat. Add sour milk and vanilla. Sift in cocoa, flour, and salt. Dissolve baking soda in hot water and then add to mix. With a large spoon, scoop out circles of batter onto baking sheet.
2Bake at 400 degrees for 6 minutes. Let Cool
add all ingredients in a large bowl. Wet with a little milk (just enough to make creamy consistency) and beat well. Spread filling onto half of the circles and place remaining circles on top.