Preheat oven to 250 degrees Fahrenheit.
Get a Cookie sheet and line it with parchment paper
Use a dinner plate as a template for a perfect circle and outline the palate with a pencil on the parchment paper. Use an appetizer plate to trace the inner circle on the parchment paper.
Carefully separate the egg whites from the yolk. Do not get any yolk in your whites, if you do, they may whip up.
In a mixing bowl, start whipping your egg whites until they from soft peaks about 4 minutes.
Add the sugar a little at a time until it is well combined.
Mix for an additional 5 minutes or until your egg whites form stiff peaks that don't droop when you take a spoonful.
Finally add the cornstarch, vinegar, and vanilla extract
Whip until fully combined.
Put the whipped whites in to a large piping bag. (if you use a fancy tip it will look extra special)
Pipe into the circle on the parchment paper tray. It will probably be about 8-10 cupcake sized mounds.
Use the back of a spoon to create a shallow trench on the top, (this is where the whipped cream will go.
Bake for about 1 hour and 15 minutes
Then turn off the oven and let the pavlova "dry out" and cool off for another hour in the oven.