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          450 g/1 lb blackcurrants, stripped from 
          their stalks 
          150 ml water 
          75 g/3 oz caster (superfine) sugar 
          3 eggs, separated 
          300 ml single (light) cream 
          300 ml double (heavy) cream  | 
        
        
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          Method: 
          
          Put the blackcurrants in a pan with the 
          water and sugar. Heat gently, stirring, until the sugar dissolves, 
          then bring to the boil and boil for 5 minutes. Puree in a blender or 
          food processor, then pass through a sieve (strainer). Beat the egg 
          yolks, then gradually whisk in the puree. Cool slightly, then stir in 
          the single cream. Turn into a freezer-proof container and freeze for 
          1—1.5 hours until half-frozen. Whisk thoroughly with a fork to break 
          up the ice crystals. Whisk the egg whites until stiff, then whip the 
          double cream until peaking. Fold the cream, then the egg whites, into 
          the mixture and freeze until firm. 
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