Place the water and salt into a sauce pan and bring to the boil

Once the salt has dissolved remove from the heat and set aside

Place the mustard seeds, coriander seeds, dill seeds, chilli and garlic into a sterilized glass jar

Add half the courgettes and top with half the thyme

Repeat and then cover with the brine mixture

Place the lid on, shake to mix and set aside for an hour before eating

Store in the refrigerator and use as needed