Preheat your oven to 250°F (120°C). Line a baking tray with parchment paper. You can draw circles as guides for even-sized mini pavlovas (about 3–4 inches wide).
Whip the Egg Whites : In a clean, dry bowl, beat the egg whites on medium speed until soft peaks form. Gradually add the sugar, one spoonful at a time, beating until stiff peaks form and the mixture is glossy and smooth. Rub a little meringue between your fingers—if it feels grainy, continue beating.
Add Stabilizers: Gently fold in the vinegar, cornstarch, cream of tartar and one teaspoon vanilla extract. These ingredients give the pavlova its signature soft interior and crisp exterior.
Shape and Bake:To make mini pavlova nests you will spoon mounds of meringue onto a parchement paper lined baking sheet, smoothing the tops and creating a slight dip in the center for the toppings. Alternatively, you can also use a piping bag. I usually do it without, using a spatula and shaping the sides. Bake for 1 hour and 30 minutes. Turn off the oven, crack the door slightly, and let the pavlovas cool inside completely for 10 hours to avoid cracking.