Cream 1/2 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 TB dough, roll a rope about 12 inches long between
your hands. Shape into a pretzel as follows: Make a loop
bout 1 1/2" in diameter by crossing the ends, leaving 1"
tails. Flip the loop down over the crossed ends. Press
firmly into place. Place pretzels on greased baking
sheets. Bake at 350 F/175 C for about 10 minutes.
Make frosting in a small bowl. Mix cocoa and powdered
sugar. Gradually stir in butter and vanilla.
If frosting is too thick, thin with milk. When pretzels
are cool, spread with Cocoa Frosting.
