Soak the prunes overnight in just enough water or weak tea to cover.
In a large saucepan, dissolve the sugar in the vinegar and then add the spices and lemon rind. Next add the prunes with their liquid and boil very gently for 15 minutes. Remove the prunes and pack into hot, sterilised jars. Boil down the syrup until thick, about 15 minutes, and pour over the prunes to fill the jars bef