THERMOMIX METHOD

Pre heat oven to 150ºC. Place half the sugar into mixing bowl and mill 15 sec / speed 9.  Set aside.  Repeat with remaining sugar.  Clean and dry mixing bowl really well.  Insert butterfly and add egg whites to mixing bowl with the cream of tartar and whip 5 min / 37ºC / speed 3.5.  Repeat for another 5 min / 37ºC / speed 3 with measuring cup off and slowly add the icing sugar one spoon at a time through hole. With butterfly rotating 1 min / speed 3 add the cornflour, vanilla and vinegar also through hole in the lid. Cover a circular baking tray with baking paper and using a large spoon place large dollops of mixture in the shape of a wreath round the outer edge of the tray.  Make sure they are touching each other but not touching the sides of the tray. Place in oven, reduce temperature down to 120ºC/100ºC fan forced and bake 1 hour and 20 minutes.  Turn oven off, leave pavlova in the oven with a wooden spoon just wedging the door open slightly and leave overnight to cool completely.