In a metal bowl over a pan of simmering water combine bittersweet chocolate and shortening. Stir occasionally until melted and smooth. Stir in heavy cream and 1/4 cup liqueur. Place white chocolate in a separate bowl, and when the dark chocolate has melted, place the bowl of white chocolate over the pan of simmering water, stirring occasionally until smooth. Be sure to remove from heat as soon as it is mostly melted, white chocolate can be sensitive.
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