Place egg whites in bowl and whisk for 1 minutes speed 3, until soft peaks form.
Set times for 3 minutes at 40 degrees speed 3, then add the caster sugar 1Tbs at a time over the three minute period.
Set timer for 2 minutes at 50 degrees speed 3, add the cornflour, vanilla and lemon juice with the whisk running and allow the machine to continue to which until the end of the 2 minutes.
Pile the meringue on the prepared cookie sheet.
Bake in the oven for about 1 hour or until cooked.
Once cooked, turn the heat off and allow the pavlova to cool in the oven.
Assembly
Just before serving whip the cream with icing sugar and vanilla.
Add the cream to the pavlova and top with mixed berries.