Cut half of the ginger into small cubes and finely grate the other half. Put both in a saucepan with the wine and apple juice and simmer for about 1 hour. Add a little water now and then.
Then pour the contents of the pot through a fine sieve into another pot. Mix the liquid with the preserving sugar and the Gelfix.
Add about half of the solid ingredients remaining in the sieve and simmer for about 7 minutes. Fill into jam jars and screw on.