Brazilian iced chocolate - with coke

2 oz Unsweetened chocolate,
           - (2-1 oz squares)
    1/4 c  Sugar
      1 c  Coffee, double-strength,
           - and
  2 1/2 c  Milk, hot
  1 1/2 c  COCA-COLA, chilled
           Whipped cream,
           - OR vanilla ice cream
 
  In the top of a double-boiler over hot water, melt the chocolate squares.
  Stir in the sugar. Gradually stir in hot coffee, mixing thoroughly. Add the
  milk and continue cooking until all particles of the chocolate are
  dissolved and the mixture is smooth, about 10 minutes. Pour into a jar.
  Cover and chill. When ready to serve, stir in the chilled Coca-Cola.  Serve
  over ice cubes in tall glasses. For a beverage, top with whipped cream. For
  a dessert, add a scoop of vanilla ice cream.