For the pesto, roast the nuts in a pan without fat for approx. 4 minutes while turning, remove. Finely chop the cranberries, except for 2 tablespoons for decorating, and 2 tablespoons of brown sugar in the universal chopper.
Chop the nuts and, except for 2 tablespoons for decorating, mix them into the cranberries. Remove 1 tablespoon and set aside, mix the remaining pesto with sherry and apple juice. Caramelise the white sugar in a pot, take off 1 tablespoon and mix with the nut-cranberry mixture that has been set aside.
Melt 30 g butter in the remaining caramel, stir in flour and gradually add milk, stir until smooth and bring to the boil. Place sauce, lasagne dishes, pesto, sauce, one after the other in a greased casserole dish (approx. 1 litre capacity)
Sprinkle with breadcrumbs and 2 tablespoons of brown sugar. Spread 1 tablespoon of butter flakes on top. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 30 minutes.
Finely grind the cooled pesto-caramel mixture in the universal chopper. Spread thinly on a baking tray lined with baking paper to make 4 squares. Take the finished lasagne out of the oven and put the sugar mixture in the oven for 2 minutes until the sugar starts to melt and run into each other.
Allow to cool slightly and carefully remove sugar chips from the paper. Cut lasagne into 4 portions, arrange on plates and decorate with sugar chips, nuts and cranberries.