Preheat oven to 150°C and line 2 baking trays with parchment paper.
Using an electric mixer, beat egg-whites until soft peaks form.
Gradually add the caster and brown sugar, beating well until the mixture is glossy and the sugar has dissolved.
Add the cornflour, vinegar and spices and beat until well combined.
Spoon mixture into 3 x 18-20cm circles. Using a palette knife, shape into a circle.
Place in the oven, reduce the heat to 120°C and cook for 1 hour and 20 minutes.
Then turn the oven off and allow the meringues to completely cool in the oven (at least an hour).