To make the pavlova, preheat the oven to 120ºC and line a baking sheet with baking paper.
In a mixing bowl, beat the egg whites and cream of tartar on a medium speed until frothy.
Add all the sugar one teaspoon at a time while continuously whisking.
Increase the speed and whisk until stiff peaks are reached.
Sprinkle overtop the cornflour, vanilla essence, and vinegar.
Fold together to combine.
Spoon the meringue mixture onto the prepared baking sheet and shape with a palette knife forming a small nest on top.
Turn oven down to 100ºC and place the baking sheet on the bottom rack of the oven.
Bake the meringue for one hour and then turn the oven off leaving the the meringue in the oven for another five hours.