Beat the eggs, egg yolks and 80 g sugar in a metal bowl in a hot water bath with the whisks of the mixer until thick and creamy. Let the cream cool down while stirring occasionally.
Roast the nuts in a pan without fat until they smell good. Leave to cool and chop roughly. Whip the cream until stiff and fold into the egg cream with the nuts. Rinse a box form (approx. 11 x 25 cm) with water and line with cling film. Pour in parfait mixture, cover with foil and refrigerate for at least 8 hours.
Wash the plums, halve, stone and cut into large pieces. Caramelise 100 g sugar in a pot. Deglaze with wine and stir until the caramel has dissolved. Stir in vanilla pulp. Simmer the plums for 4-5 minutes. Stir cornflour with a little cold water until smooth. Bind the plums with it. Let the groats cool down.
Turn over the parfait, remove the foil and cut into slices. Serve with biscuits and groats.