Method
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step 1
Put the cucumbers, onion slices and salt in a sieve set over a bowl, and cover with ice and something to weigh it down. Let stand for 1-2 hrs in the fridge, then drain well. (This helps to push the water out of the cucumber, which means it will stay crunchy later when brined.)
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step 2
Meanwhile, put the vinegar, 200ml water, the sugar, turmeric, celery seeds, chilli flakes and mustard seeds in a small saucepan over a medium heat. Bring to the boil and simmer for 5 mins. Remove from the heat and leave to cool to room temperature. Put the cucumber and onion mixture in a 500ml- capacity jar or sealable plastic container, pour over the brining liquid, cover and seal. Chill for at least 3 hrs. Will keep in the fridge for 2 weeks.