The day before, line a box mould (20 cm long; approx. 3⁄4 l content) with cling film. Sort the raspberries. Separate the eggs. Whisk egg yolks with 75 g icing sugar and 2 tbsp. hot water in a hot water bath until thick and creamy.
Then beat the cream in a cold water bath until it has cooled down completely.
Stir sour cream into the cream. Whip cream and egg whites separately until stiff and fold in. Fold in 200 g raspberries. Pour the mixture into the mould and freeze overnight.
The next day, lightly crush 100 g raspberries and 1 tablespoon icing sugar. Roast the nut leaves until golden brown. Turn out the parfait, cut it into 8 thick slices and cut them in half diagonally. Arrange parfait with remaining raspberries and raspberry puree and serve immediately.
Sprinkle with nut leaves.