Cream half cup butter and the sugar until light and fluffy. Beat in the egg, vanilla, and milk. Sift cocoa and flour. Mix into butter mixture until thoroughly blended. Chill dough until firm enough to handle (about 30 minutes). Using 2 T dough, roll a rope about 30 cm long between your hands. Shape into a pretzel as follows: Make a loop bout 4 cm in diameter by crossing the ends, leaving 3 cm tails. Flip the loop down over the crossed ends. Press firmly into place. Place pretzels on greased baking sheets. Bake at 180ºC . for about 10 minutes. Make frosting in a small bowl. Mix cocoa and confectioners' sugar. Gradually stir in butter and vanilla. If frosting is too thick, thin with milk. When pretzels are cool, spread with Cocoa Frosting. Make 2 dozen. ----