The truffles are very easy to make.
Combine a family block of dark chocolate and four tablespoons of Nutella in a heatproof bowl. Melt together on medium heat in the microwave, use one minute intervals. Stir the mixture and then place in the fridge. When nearly set but not hard, beat the mixture until it becomes light and fluffy. I use an electric handbeater. Return mixture to fridge to firm up but do not allow to set.
Spoon out teaspoons of the Nutella mixture and roll in chopped hazelnuts. A roasted hazelnut in the centre is even more delicious. Refrigerate.