Preheat oven to 300�F / 150�C. Put egg whites into a medium size mixing bowl and with a handmixer beat them until soft peaks form. Put the Stevia into the mixing bowl and keep beating the eggs. Mix vanilla extract lemon juice with the egg whites. Beat until hard peaks form. Prepare a baking tray with parchment paper and place the beaten egg whites in the middle of it. Simply by turning the bowl upside down or if we are in a playful mood let's get out our spatula. Place the baking tray in the preheated oven for an hour. Do not open the oven door after the cake is placed in as underbaked Pavlova may collapse. After an hour turn the oven off and leave the Pavlova inside until it is completely cooled. It would take about 2 hours but even better if it is left there overnight. Decorate with fruit and cream just before serving it.