Chocolate Sheet Cake - cooking recipe

Ingredients

2 c. flour
2 c. sugar
4 Tbsp. cocoa
1 stick butter
1/2 c. shortening
1 c. water
1/2 c. milk with 1 Tbsp. vinegar added
1/2 tsp. cinnamon
1/2 tsp. salt
1 Tbsp. soda
1/2 tsp. vanilla
2 beaten eggs

Preparation

Mix together in large bowl, flour, sugar and cocoa.
Bring to boil butter, shortening and water; pour into bowl and beat well, then add milk, vanilla, cinnamon, salt, soda, and eggs; beat well. Pour onto greased sided sheet pan or cookie sheet.
Bake at 400\u00b0 for 20 minutes.
While cake is baking, melt 1/2 cup butter, 6 tablespoons milk, 1 teaspoon vanilla and 4 tablespoons cocoa. Bring just to boil and add 3 1/2 cups powdered sugar.
Mix until smooth and pour and spread over cake as soon as it is removed from oven.
Let cool.
Serve.