Mix the marzipan, rum and walnuts together in a bowl and then roll into small balls; if you find the mixture becomes too sticky, just knead through a little icing sugar to firm it up.

Melt the chocolate slowly in a bain marie, and stir until smooth. Now dip the marzipan balls in the chocolate, using two forks to pick them up and place on a wire rack until nearly set. As soon as they are firm (but not hard) remove them with a palette knife and leave on a sheet of greaseproof paper until properly set. If you leave them on the wire rack too long they will get stuck; likewise if you leave them to set straight on the paper they will end up sitting in puddles of chocolate.

Place in petit four cases for a lovely little home-made gift!