Place leeks into a large bowl. Sprinkle with salt. Massage the leek with your hands. Add turmeric and stir through.
Place remaining ingredients in the Thermomix bowl. Chop 6 sec/speed 6. Tip out on to the leek mixture and stir to combine.
Spoon into sterilised jars pushing down firm. Top with a piece of reserved leek.
Allow to bubble away at room temperature for a few days. This just improves over time, but once you are ready to use, remove the top layer leek and refrigerate. It is delicious and lasts for months.