For 6-8 servings:
Roll out the pastry tinly and use to line the tart tin. Chill or freeze for 15 minutes, bake blind, then cool. Put the mascarpone, cream and liqueur in a bowl and beat until thick. Cover the surface with the berries, mounding them up in the centre. Spoon the fruit jelly over the top, then let set in the refrigerator for no longer than 10 minutes before serving (or the tart will become soggy)