Cook the lasagne sheets in plenty of salted water according to the instructions on the package, lift them out with a slotted spoon, rinse in cold water and pat dry.
Roast the shaved hazelnuts in a pan without fat until golden brown.
Halve the avocado, remove the stone, peel and cut the pulp into cubes.
Mash the avocado cubes with a fork and stir together with the sour cream and lime juice. Stir in the hazelnut slices and season with salt and pepper.
Using a teaspoon, place the avocado cream on one end of the lasagne sheets and roll up the lasagne sheets.
Chill the rolls for at least two hours.
Cut the rolls into approx. 3 cm wide slices. Cover a dessert plate with lettuce and place the sliced lasagne rolls on top.