Try germinating some seed that has simply been dried straight from the fruit (after a resting period). Also, try fermenting some of the seed and after a resting period, try germinating it as well. The seeds that germinate better would represent the better method.
Offered by Roger.
The California Rare Fruit Growers association has fruit specialist volunteers that can answer many specific questions from people needing answers about non traditional fruit.
Offered by Steve.