In a medium saucepan stir together all ingredients except rhubarb
Bring to a boil and boil, stirring until sugar is dissolved
Reduce heat and simmer 5 more minutes
Strain and discard solids
Pack rhubarb into 4 250 ml jars (half pint) Pour the hot liquid into the jars to ½ below rims.
Center lids on jars and screw on rings until finger-tip tight
Process in a boiling water bath 10 minutes.
Allow to cool, then label and store unopened jars in a cool dark place