For the lemon and egg liqueur pudding with nut brittle, first whip the whipped cream until stiff and store in the refrigerator. Mix the starch with a little water.
Wash the lemons, dry them, grate some lemon zest and squeeze the lemons. Heat the eggs and sugar in a saucepan, whisking constantly.
When the mixture becomes foamy, stir in the lemon juice and milk, add the stirred starch and cook for 2 minutes.
Remove from heat and cool in a water bath, stirring frequently. When the pudding is almost cool, mix in the whipped cream and lastly stir in the eggnog.
Refrigerate for 2 hours. In a coated pan, without fat, let the chopped nuts brown a little, sprinkle with powdered sugar and let them caramelize.
Arrange the pudding in bowls, decorate with the nut brittle and bring the lemon eggnog pudding with nut brittle to the table.