Preheat your oven to 275°F (140°C). Line a baking sheet with parchment paper.
In a clean, dry bowl, beat the egg whites with an electric mixer until they form soft peaks.
Gradually add the sugar, one tablespoon at a time, beating well after each addition. Keep mixing until the meringue is thick and glossy and holds stiff peaks.
Gently fold in the cornstarch and white wine vinegar using a spatula. This helps the pavlova keep its shape and stay soft inside.
Spoon the meringue onto the parchment paper, shaping it into a circle about 8 inches wide with slightly higher edges to hold the filling.
Place the pavlova in the oven and bake for about 1 hour and 10 minutes. Then turn off the oven and leave the pavlova inside for another hour to cool slowly. This drying process makes the outside crisp while the inside stays soft.
Once cooled, spread the lemon curd inside the pavlova shell.
Whip the cream until it forms soft peaks and dollop it on top of the lemon curd.
Arrange the sliced mango and spoon the passion fruit pulp and seeds over the cream.
Serve immediately and enjoy the fresh, tropical flavors with the sweet, crunchy pavlova base.