In a medium bowl, combine the finely chopped walnuts and the silan (date syrup). Cover and place in the fridge for 30 minutes, until the mixture is firm.
While the silan and walnut mixture is in the fridge, place the extremely finely chopped walnuts on a large plate.
Once the mixture is chilled, remove from the fridge. Roll the charoset, 1 tablespoon at a time into a ball, and coat in walnuts.
The charoset truffles can be stored in an airtight container in the fridge for up to 2 weeks. These charoset truffles will become soft when left at room temperature.