1Wash the cucumbers and peel the onions.
2Thinly slice the cucumbers and onions. Layer in a tray with the salt and leave for 24 hours.
3Drain and rinse the cucumbers and onions.
4Place the sugar, cider vinegar, turmeric, cloves and mustard seeds into a pan and bring to the boil.
5Add the cucumber/onion mix to the liquid and boil for 1 minute. Drain, retaining the liquid and pot into warmed jars.
6Bring the liquid back to the boil and add to the jars.