Place the mustard seeds, sugar, salt, peppercorns, cloves and turmeric in a blender or food processor and blend evenly.
Gradually add the vinegar, 15ml/1 tbsp at a time, blending well between each addition. Then continue blending until you have a coarse paste.
Leave to stand for 10-15 mins to thicken slightly then spoon into warm jars and seal. Ensure there are no air pockets by pressing down with the back of a teaspoon or a round ended knife. Allow to mature for 2 weeks before using.