Hi Fly-fisher and welcome to WAB. Most members use their search engines to look for stuff but seeing as how it's your first post
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1kg rosehips, washed and chopped
1kg caster sugar
You will also need a jelly bag (or a clean cotton cloth and a big sieve)
Put two litres of water in a large pan and bring to the boil. Throw in the chopped rosehips, bring back to the boil, then remove from the heat, cover and leave to infuse for half an hour, stirring from time to time.
Strain the mixture through a jelly bag. (Alternatively, line a colander with a couple of layers of muslin and place over a large bowl. Tip in the rosehip mixture, and leave suspended over the bowl.)
Set the strained juice aside and transfer the rosehip pulp back to the saucepan, along with another litre of boiling water. Bring to the boil, remove from the heat, infuse for another half an hour and strain as before. Discard the pulp and combine the two lots of strained juice in a clean pan. Bring to the boil, and boil until the volume has decreased by half. Remove from the heat.
Add the sugar and stir until dissolved. Return to the stove, bring to the boil and boil hard for five minutes. Pour into warmed, sterilised jars or bottles and seal.