Preheat oven to 200 degrees C.
Grease and line a Swiss roll or lamington tin.
Whisk egg whites until stiff, gradually whisk in sugar, beat well. Fold in cornflour, vinegar and vanilla mixture.
Spread mixture in Swiss roll tin which has been greased with butter and lined with grease proof paper.
Bake for 15 minutes or till slightly brown at the top.
Remove from oven and cover with damp tea towel allow to go cold in tin.
It will shrink down when cooling. When cold turn onto a piece of sugared paper and remove the baking paper from the pavlova.
Spread with whipped cream, sliced strawberries, sliced bananas any fruit of your choice.
Roll up like a Swiss roll. Top can be sprinkled with castor sugar or grated chocolate.