Texas Sheet Cake

Ingredients

• 2 cups flour
• 2 cups sugar
• 1/2 tsp. salt
• 1 stick butter
• 1/2 cup Crisco oil
• 1 cup water
• 5 tbsp. cocoa
• 1/2 cup sour cream
• 2 eggs
• 1 dash salt
• 1 tsp. vanilla
• 1 tsp. soda powder
• 1 stick butter
• 5 tbsp. cocoa
• 1/3 cup milk
• 1 box sifted powdered sugar
• 1 tbsp. vanilla
• 1 cup walnuts, chopped