Chocolate Sheet Cake

Ingredients

• 2 cups sugar
• 1/2 teaspoon salt
• 2 cups all-purpose flour
• 8 tablespoons (1 stick) butter
• 1/2 cup vegetable oil
• 1 cup water
• 1/4 cup cocoa
• 2 eggs
• 1 teaspoon baking soda
• 1/2 cup buttermilk
• 1 teaspoon vanilla
• 8 tablespoons (1 stick) butter
• 3 tablespoons cocoa
• 6 tablespoons milk
• 1 teaspoon vanilla
• One 16-ounce box powdered sugar
• 1 cup chopped pecans or walnuts