Preheat oven to 140°C Mark three 18 cm circles on separate sheets of baking paper, then line 3 oven trays with baking paper, ink side down.
Put egg whites in the large bowl of electric mixer and beat, using whisk attachment, until stiff peaks form. Add sugar 1 tablespoon at a time, beating until a thick and glossy mixture forms.Sift cornflour and whisk until combined..
Divide meringue among circles on trays, using the back of spoon too fill the circles and make decorative peaks. Bake for 1 hour. Turn off oven. Allow to cool completely in oven , with door ajar.
Meanwhile, put cream and sugar in the bowl of an electric mixer and beat, using whisk attachment until peaks form, set aside.
To assemble, put 1 meringue disc on a serving platter. Sprinkle over 1/3 of the crushed berries, then spoon over 1/2 of the cream, 1/2 of the raspberries, 1/2 of the shortbread and 1/2 of the lemon curd. Repeat layering once more, finish with remaining meringue disc and dusting with remaining crushed berries. Serve.