Halve the vanilla pod and scrape out the pulp. Simmer all ingredients in a pan or saucepan over low heat for 20 minutes. Remove the vanilla pod and clove.
Pour the jam up to the brim in a glass rinsed with hot water, close it and turn it upside down to create a vacuum. Let cool down like this.
If you like the jam without seeds, the mixture is passed through a sieve before filling.