Preheat the
oven to 350°F/190°C/gas
5.
Butter a
10-inch (25-cm) square baking
pan.
Sift the
flour, confectioners' sugar, and salt into a
large bowl.
With an
electric mixer at medium speed, beat in the
butter and whole egg until well blended.Firmly press
the mixture into the prepared pan to form a
smooth, even layer.
Bake for 10
minutes.Reduce
the oven temperature to 300°F/150°C/gas
2.
Warm the
preserves in a small saucepan over low heat
until liquid.
Spread the
preserves over the base. With mixer at medium
speed, beat the egg whites in a large bowl until
soft peaks form.
With mixer at
high speed, gradually add the superfine sugar
and cinnamon, beating until stiff, glossy peaks
form. Spread the meringue on top of preserves.
Bake for
20-25
minutes, or
until the meringue is lightly browned. Cool in
the pan for 15 minutes. Cut into squares and let
cool.