Cake:

In a bowl mix flour, sugar, sour milk, eggs, vanilla and cinnamon. In a small pan mix shortening, margarine or butter, water and cocoa. Bring to a boil and let boil one minute. Add the boiled mixture to the ingredients in the bowl. Mix well and pour into 11 x 17″ sheet cake pan that has been greased and floured.

Bake for 15 minutes at 350°.

Frosting:

In a pan bring to a boil the margarine or butter, sour milk and cocoa. Remove from heat and add the boiled mixture to the other ingredients in a mixer bowl, mix well and spread on warm cake.