Peel the figs and chop them into small pieces. Add 4 tablespoons of water, puree. Bring to the boil with sugar and vinegar and boil down over low heat, stirring continuously, for about 10 minutes.
Stir mustard and 4 tablespoons of water until smooth. Stir into the fig mixture. Simmer for another 5 minutes. Immediately pour into prepared twist-off jars and close. Let cool off