Ingredients:
200gr toasted hazelnuts
200gr flour
200gr sugar
200gr soften butter
2 eggs
Grated lemon skin

Preparation:
Combine butter with sugar, mince hazelnuts.

Sieve flour over a wooden surface, make an hole in the middle and pour butter, sugar, yolks, hazelnuts, lemon skin in, knead all ingredients.

Beat egg whites until stiff peaks forms and add to knead very gently. Stir well till dough is uniform, soft and dense.

Pour knead in a oven-pan and bake in 180°C oven for 40 minutes.