Preheat the oven
to 300°F/150°C/gas 2. Line a cookie sheet with
waxed paper.
Beat the egg whites and salt in a
large bowl with an electric mixer at medium speed
until frothy.
With mixer at high speed, gradually
add the superfine sugar, beating until stiff, glossy
peaks form.
Use a large rubber spatula to fold in
the coffee extract,hazelnuts,
and cornstarch. Fit a pastry bag with a 1/2-inch
(1-cm) star tip.
Fill the pastry bag, twist the
opening tightly closed, and squeeze out 2-inch
(5-cm)
stars, spacing 2
inches (5 cm) apart on the prepared cookie sheet.
Bake for 80-90
minutes, or until
the meringues are crisp and lightly browned. Cool
in the oven with the door ajar.