Helen's Brownies (similar to Mississippi Mud Pie)

1 cube butter or margarine
1/2 cup oil
1 cup water
4 tablespoons cocoa


Bring to a boil, stirring constantly.  Remove from heat.


In large bowl, sift:
2 cups flour
2 cups sugar
1 teaspoon baking soda


Pour boiled liquid gradually into flour mixture, stirring until blended.


Add:
2 slightly beaten eggs
1 teaspoon vanilla
1/2 cup buttermilk


Pour into a jelly roll pan.  Bake at 375 degrees for 15 to 20 minutes.


FROSTING:
1 cube butter or margarine
4 tablespoons cocoa


Melt, remove from heat.


Add:
6 to 8 tablespoons milk or Half & Half
1 box powdered sugar, whole box at one time


Will be lumpy, but continue to beat until smooth.


Add: 
1/2 to 1 cup chopped walnuts


Add a little more milk if frosting is too thick.  Frosting spreads better if spread while brownies are still warm.