Preheat oven to 150˚C.
Line a baking tray with baking paper.
Beat egg whites until stiff peaks form, add sugar, a little at a time, still beating.
While beating, gradually add the caster sugar, a little at a time.
Add the vanilla and beat to combine.
Place small spoonfuls of, or pipe the meringue onto the baking tray.
Bake for 45 minutes. Turn the oven off and open the door slightly, leaving it ajar until the meringues have cooled completely in the oven.
Store in an airtight container lined with grease proof paper.
Serving suggestions:
As a general rule, allow 60g castor sugar to 1 egg white.