Preheat the Oven ; Preheat your oven to 300°F (150°C). Line a baking sheet with parchment paper and draw an 8-inch circle as a guide.
Beat Egg Whites ; In a clean mixing bowl, use an electric mixer to beat the egg whites on medium speed until soft peaks form.
Add Sugar Gradually ; Slowly add the granulated sugar, one tablespoon at a time, beating continuously. Continue until the mixture is glossy and stiff peaks form.
Incorporate Cornstarch, Vinegar, and Vanilla Gently fold in the cornstarch, vinegar, and vanilla extract with a spatula until just combined.
Shape the Meringue ; Spoon the meringue onto the prepared baking sheet, using the circle as a guide. Shape it into a nest with slightly raised edges.
Bake ; Reduce the oven temperature to 250°F (120°C) and bake for 1 hour 15 minutes. Once baked, turn off the oven and let the meringue cool completely inside with the door slightly ajar.
Prepare Whipped Cream ; In a separate bowl, whip the heavy cream and powdered sugar until soft peaks form.
Assemble the Pavlova ; Carefully transfer the cooled meringue to a serving plate. Spread the whipped cream over the top, then decorate with fresh fruits.
Serve ; Slice and serve your beautiful Pavlova immediately. Enjoy!