Mix flour salt and sugar in a large bowl. Bring butter, water, and cocoa to a boil in saucepan. Pour over flour mixture; mix well. Add eggs, buttermilk, vanilla, and baking soda; mix well. Pour into greased 11 x 17 inch cake pan. Bake at 350 for 20 minutes.

Frosting:
Melt butter with milk and cocoa in saucepan. Remove from heat. Add powdered sugar, pecans, and vanilla. Beat until spreading consistency. Spread over cooled cake. Enjoy!