Preheat the oven
to 250°F/130°C/gas 1/2. Line two cookie sheets with
parchment paper.
Sift 1 tablespoon of confectioners'
sugar and the cocoa into a small bowl. Stir in the
coffee granules.
Beat the egg whites and salt in a
large bowl with an electric mixer at medium speed
until soft peaks form.
With mixer at high speed,
gradually add the remaining confectioners' sugar,
beating until stiff, glossy peaks form. Fold in
the cocoa mixture and vanilla.
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 1/2-inch (6-cm) rosettes, spacing 2 inches (5-cm)
apart on the prepared cookie sheets.
Bake for
50-60 minutes, or until the meringues are dry to the
touch. Turn the oven off.
Carefully lift the
meringues off the paper, press in the bottoms
slightly, and return to the warm oven for 30 minutes
more. Transfer the meringues to racks to cool
completely.