Carefully separate the egg whites from the yolks making sure no yolks are in the whites. Place in the mixing bowl with the cream of tartar.
With a stand mixer or a hand-held mixer, turn to low speed begin mixing the egg whites. Gradually increase the speed to no more than medium until stiff peaks form. Approximately 5-10 minutes.
Once stiff peaks have formed, add the sugar 1 tablespoon at a time. Count to 5 before adding more sugar. Once all the sugar is incorporated, turn off the mixer.
The mixture will be glossy and very sticky.
Line a cookie sheet with parchment paper or a Silpat liner. Scoop out all the meringue with a spatula in the middle of the pan. Gently push out the edges to form a circle. You want to keep it somewhat compact (about 8-9 inches diameter) With these dimensions there will be some height to your Pavlova.
Bake in a preheated 200-degree oven for 1 1/2 hours. Turn off the oven and let cool for at least one hour up to overnight. Do not peak in the oven. Just let it cool slowly.
Once the Pavlova has cooled completely, carefully loosen it with a spatula and transfer to a serving dish. I used 2 spatulas to lift mine carefully.