Bring the cream to the boil and remove from the heat. Dice the nougat and melt it while stirring. Let it cool down. Then cover and chill for 2-3 hours.
Roast chopped hazelnuts without fat. Cool down. Whip nougat cream with hand mixer for approx. 1 minute until creamy. Fold in roasted nuts. Pour into a piping bag with a perforated spout (medium size, must fit into the opening of the hollow balls!). Pour into the hollow spheres to the brim. Chill for approx. 1 hour
Coarsely chop the couverture and the plate-grease and melt in a hot water bath. Leave to cool a little. Halve the pistachio kernels
Dip the chocolates halfway into the chocolate coating with the opening facing downwards. Place on a chocolate rack or a piece of baking paper. Decorate the pralines with hazelnuts, almonds, pine nuts and pistachios. Allow to dry