Melt butter in pan, then add condensed milk and beat slowly (do not boil). In bowl place dry drinking chocolate and coconut, add crushed biscuits, then add butter and condensed milk and mix thoroughly. Allow mixture to cool for approximately 2 - 3 hours. Divide into approx 40 rounds and roll in chocolate vermicelli or finely ground coconut andplace in small paper cases.
You can add rum or sherry to ingredients for extra taste.