Cream the butter with the icing sugar, then add the ground pecans and hazelnuts.
Beat egg white and pinch salt until stiff. Add the caster sugar and continue beating for 2-3 minutes. Fold in the egg whites into the walnut-hazelnut mixture.
Wash the pears, cut them in two, remove the core and grate the pears.
Pour half of the nut mixture into a cake pan. Spread the chestnut puree of top with the help of a spoon.
Arrange the grated pears on the chestnut puree then pour the rest of the nut preparation.
Place in the oven and bake for 50 minutes. Let cool completely
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