Method

1. Beat egg whites until stiff.

2. Add 1/2 cup of castor sugar, beat thoroughly until the sugar is dissolved- about 5 minutes.
3. Add remaining sugar, 1 tablespoon at a time, beating well after each addition.
4. Lightly fold in the cornflour then the vinegar.
5. Scrape the mixture out into a pile onto grease proof paper. Shape it into a circle and keep it fairly high in shape as it spreads a bit as it cooks.
6. Place on a low shelf in a pre heated oven 200 degrees celsius, then immediately reduce heat to 125 degrees and cook for 1 1/4 to 1 1/2 hours. Cool in the oven.