Pour the milk into a bowl. Stir in the crème de cassis and sprinkle the gelatin powder over the surface. Set aside for 10 to 15 minutes, until the gelatin is softened.
In a saucepan, combine the cream and sugar. Warm over medium-low heat, stirring to dissolve the sugar.
Heat the cassis milk to dissolve the gelatin and stir into the cream mixture.