Remove the flower and stem from the gooseberries. Cut the vanilla pod lengthways and scrape out the vanilla pulp.
Chop the gooseberries with a hand blender or spin them through the meat grinder. Then mix with the preserving sugar. Add the vanilla pod and pulp, bring the fruit to the boil while stirring and continue to simmer for 8-10 minutes. Make a gel test. Take out the vanilla pod.
Pour the jam into prepared jars and close them immediately.