Coarsely grate the marzipan. Mix with liqueur using the hand mixer. Pour into a piping bag with a small perforated spout. Fill the hearts with it until just under the edge, smooth it down. Cool for 12 hours
Chop the dark chocolate and melt in a hot water bath. Pour into the freezer bag, cut off a small corner. Seal hearts with it. Cool for about 1 hour.
Chop white couverture, melt. Pour into a freezer bag, cut off a small corner. Decorate hearts with it and with pearls. Dry and store in a cool place