The ultimate New York cookie.
Combine the white frosting ingredients until smooth. Using a brush or spoon, spread this frosting on one half of the flat side of each cookie. For the black frosting, place the butter and cream in a saucepan and bring to the boil over medium heat. Remove from the heat, add the chopped chocolate and let it melt for 1 minute, then add the icing sugar and boiling water. Spread the black frosting on the other half of the cookies. Lay the biscuits on a wire rack to let the icing harden.
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