For the nut pudding, bring the butter to room temperature and stir until creamy. Mix walnuts and one egg and stir into the butter mixture.
Separate the remaining 6 eggs. Cream the yolks, powdered sugar and cherry liqueur in a food processor and stir in the nut butter custard.
Beat egg whites until stiff and fold in. Grease a pudding mold and dust with flour. Pour in mixture, seal very tightly and cook in steam for at least 60 minutes.
Turn out the nut pudding and serve.