Finely grind 2/3 of the nuts and lightly toast them in a pan without fat, allow to cool. Beat egg yolks and honey in a water bath until creamy, fold in roasted nut flour and let cool. Whip the cream until stiff and fold in. Line a freezer-safe form with cling film and pour in the cream, cover and freeze for a few hours.
For the sauce, mix the sauce powder with a little milk. Heat the rest of the milk, add the cinnamon stick and brown sugar, stir in the mixed sauce powder and bring to the boil, remove the cinnamon stick. Let the sauce cool down a bit, stirring occasionally. Chop the remaining nuts.
For serving: cut the parfait into slices or shape into balls, arrange on plates with prepared fresh fruit slices according to your taste, sprinkle with chopped nuts and serve warm sauce separately.