Chocolate-Cinnamon Sheet Cake
["2 c. sugar", "2 c. flour", "1 stick butter", "1/2 c. shortening", "4 Tbsp. cocoa", "1 c. water", "1 tsp. soda", "1 tsp. cinnamon", "2 eggs, slightly beaten", "1 tsp. vanilla", "1/2 c. buttermilk or sour milk", "1 stick butter", "4 Tbsp. cocoa", "6 Tbsp. milk", "1 box powdered sugar, sifted", "1 tsp. vanilla", "1 c. chopped pecans"]
["About 5 minutes before cake is done, melt butter, cocoa and milk together in a saucepan and bring to a boil.", "Remove from heat and add powdered sugar, vanilla and pecans.", "Beat well and spread on cake while still hot.", "Leave cake in pan to frost."]
["sugar", "flour", "butter", "shortening", "cocoa", "water", "soda", "cinnamon", "eggs", "vanilla", "buttermilk", "butter", "cocoa", "milk", "powdered sugar", "vanilla", "pecans"]