Melt the butter and unsweetened chocolate over low heat in heavy saucepan on stove.Remove from heat. Beat in the sugar and vanilla. Add the eggs. Mix all with wire whisk or large spoon until blended well. Add the salt and flour and mix just until flour is incorporated into batter. Do not over mix.
Pour into a greased 11x17 jelly roll pan. Bake at 350 degrees for 20 minutes. Insert toothpick. Toothpick should come out with crumbs attached. Do not overcook if you want a fudge like texture.
Fudge Frosting:
Melt the butter and semi sweet chocolate together. Add 1 tablespoon vanilla. Beat in the powdered sugar and dash of salt. Thin with milk or cream.
Mixture should be the consistency between a frosting and a glaze.
Frost the brownies while still warm, but not hot.
If you want to add nuts, sprinkle chopped nuts on top of brownies right after frosting.
Notes
-These brownies freeze well, and are best when cut into SMALL squares. They are the consistency of fudge and are very rich.