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Remove from the heat and stir in a few drops of the flavouring of your choice. Leave to cool for a few minutes.
When cool, pour on to an oiled slab and gently turn the edges into the middle with an oiled knife. Repeat this process until the mixture cools and firms. Dust the hands with icing sugar an pull and work the mixture until it becomes dull and harder. Pull for about 10 minutes into strips and then cut into short lengths. Place on a tray lined with greaseproof paper. Leave in a warm place for 24 hours until the rock softens and becomes powdery.
Store in an airtight tin lined with greaseproof paper.