Dubai-style truffles with dates, chocolate & kadaifi

For the truffles:

150 g soft dates 80 g pistachios 100 g dark chocolate (couverture) 2 tbsp cocoa powder 1/2 tsp ground cardamom 1 A pinch of salt 2 pieces syrup-soaked kadaifi (about 150 g)

For the coating:

50 g melted dark chocolate 2 tbsp chopped pistachios