Heat the oven to 150C. Line two baking trays with baking paper.
Put the egg whites in a large, clean bowl and beat them with an electric whisk at a slow speed. Once they are looking frothy increase the speed to medium and whisk until you have a stiff foam that stands upright on the beaters. Whisk in the sugar a tablespoon at a time on high speed and keep whisking until you have a stiff, glossy meringue. The sugar should be fully dissolved by this point.
Spoon the meringue onto the baking paper using a large metal spoon. Put the meringues in the oven and turn the heat down to 140C and cook for 1 hour. Turn the oven off and leave them to cool in the oven.
Recipe courtesy of Ready Egg, developed by Source Management.