Meanwhile, combine mustard powder, mustard seeds (they will give it a bit more texture), water, lemon juice, salt and black pepper in a small bowl. Add the mixture to the figs and cook for 10 more minutes. Fill in the jars and enjoy! For the amount of figs used, the outcome is two Weck 220 ml jars (7.4 fl oz).
Store them in the fridge for up to one month.