Place the dark chocolate into a bowl then melt over a pan of barely simmering water.
Remove from the heat then stir in the butter and cream. Allow to cool for a few minutes until it starts to thicken.
Spoon a large teaspoon of the truffle mix into the centre of the dates, sprinkle with the toasted nuts then set aside.
Place two-thirds of the white chocolate into a bowl then melt over a pan of barely simmering water. Add the remaining third then stir vigorously until completely melted.
Drizzle (or pipe) the white chocolate over your date truffles.