-
Preheat the
oven to 325°F/170°C/gas 4. Spread the hazelnuts
on a large baking sheet. Toast for 7 minutes, or
until lightly golden.
-
Transfer to a
large cotton kitchen towel. Fold the towel over
the nuts and rub them in the towel to remove the
thin inner skins.
-
Discard the
skins and coarsely chop the, nuts. Butter a
cookie sheet. Sift the flour, cinnamon, cloves,
and salt into a medium bowl.
-
Beat the eggs
and egg yolk and sugar in a large bowl with an
electric mixer at high speed until very pale and
thick.
-
Mix in the
dry ingredients, hazelnuts, lemon zest, and
vanilla to form a smooth dough. Divide the dough
in half.
-
Form the
dough into two 12-inch (30-cm) long logs about 1
1/2 inches (4 cm) in diameter and place them 2
inches (5 cm) apart on the prepared sheet.
-
Bake for
3D-40 minutes, or until firm to the touch. Cool
on the cookie sheet for 15 minutes.
-
Cut on the
diagonal into 1 1/2-inch (4-cm) slices and
transfer to racks to cool completely.