Ms F's Fine, Fancy Fudge

Ingredients

 * 6 tablespoons of butter or butter substitute
 * 1/4 cup of milk
 * 1 box of confectioner's sugar
 * 1/2 cup baking cocoa
 * 1/4 teaspoon salt
 * 1 tablespoon vanilla extract
 * 1 cup chopped walnuts (optional)

Directions
Place the butter and the milk in a heavy pot