Mix flour, sugar, cocoa, coffee or water, oil, salt, and vanilla until a smooth batter is formed. Do not over mix*. Mix soda and vinegar until soda is dissolved and add to cake batter. Stir into batter until soda solution is thoroughly incorporated. Pour into 9″x13″ greased pan (can use 2 – 9″ round pans).

Bake at 350 degrees for 30 – 40 minutes or until cake tester comes out clean in the middle of the cake.

* Over mixing causes cake to become tough. Mix only until ingredients are thoroughly combined.