Texas Sheet Cake

Ingredients

• 2 cups flour but not really … more like 1 cup and just a hair shy of another cup … 1 cup and 1 not-quite-level cup
• 2 cups granulated sugar
• 1/2 teaspoon salt
• 16 tablespoons margarine
• 1 cup water
• 3 tablespoons cocoa powder
• 2 eggs
• 1 teaspoon baking soda
• 1/2 cup buttermilk
• 1 teaspoon vanilla extract
• 1 teaspoon ground cinnamon
• 8 tablespoons margarine
• 3 tablespoons cocoa powder
• 6 tablespoons milk
• 1 pound confectioners' sugar
• 1 cup chopped pecans or walnuts
• 1 teaspoon vanilla extract
• 1/2 teaspoon cinnamon