-
Preheat the oven
to 300°F/150°C/gas 2. Line a cookie sheet with
parchment paper.
-
Beat the egg whites in a medium
bowl with an electric mixer at medium speed in a
bowl over barely simmering water.
-
With mixer at high
speed, gradually beat in the granulated and vanilla
sugars. Mix in the ground hazelnuts, nutmeg, and
lemon juice
and beat until frothy.
-
The mixture should remain
just warm to the touch. Remove from the water and
beat with an electric mixer until stiff and glossy.
Mix in the nuts.
-
Fill a pastry bag fitted with a
1/2-inch (1-cm) plain tip and squeeze out 1-inch
(2.5-cm) rounds onto the prepared cookie sheets.
-
Press a hazelnut into the center of each cookie. Brush lightly with water and dust with the
confectioners' sugar.
-
Bake for
15-20
minutes, or until
lightly golden around the edges and just firm to the
touch.
-
Transfer on their parchment to racks and
cool until the cookies firm slightly. Peel from
the paper and let cool completely.