Cut the rosehips in half lengthways. Then de-seed them. Rinse and strain the rosehips.
Place the sugar into a large bowl. Then add the water, vinegar and juniper berries, cloves, mustard seeds, salt and bay leaves. Bring to a boil and simmer for 30 minutes. Skim off any froth.
Sterilise your jars and make sure they are not boiling (not very cold) when you fill them up with the rosehip pickle mixture. Cap and make sure you label them.