Step 1

Place the sugar into a clean and dry Thermomix bowl. Mill on Speed 10 for 15 seconds. Set aside in a separate bowl.

Step 2

Wash and dry the Thermomix bowl so that it is completely clean and there is no moisture whatsoever remaining. Insert the butterfly.

Step 3

Add the room temperature egg whites and the cream of tartar to the Thermomix bowl. Whip for 3-4 minutes on Speed 3.5, 50 degrees or until stiff peaks have formed.

Step 4

Reduce to Speed 2.5 (with the temp still on 50 degrees) and add the sugar, one tablespoon at a time (this will take a further 3-4 minutes approximately).