Texas Sheet Cake

This is my entire family's GO TO cake. It's what my mom made for our birthdays, what she made to take to parties, and it's what I'm now known for with all of my in laws.

Cake:
2 cups sugar
2 cups flour
pinch salt
1/4 cup butter
1 cup water
4 tablespoons cocoa
1/2 cup oil
1/2 cup buttermilk
2 beaten eggs
1 teaspoon baking soda
1 tablespoon vanilla

Frosting:
1/2 cup butter
4 tablespoons cocoa
4 tablespoons milk
1 teaspoon vanilla
1 box powdered sugar

Heat oven to 400 degrees. Grease and flour jelly roll pan. Mix together sugar, flour, and salt in a bowl. Bring to a boil butter, oil, water, and cocoa. Add sugar and flour mixture. Stir together buttermilk, eggs, soda, and vanilla. Add to above mixture and mix well. Bake at 400 for 20 minutes.

Make frosting while cake bakes. Bring to a boil butter, cocoa, and milk. Take of stove and add vanilla and powdered sugar- beating well with a whisk. Pour over cake while still hot.