Pavlova

Name: Pavlova
Cuisine: European
Ingredients: 150 g egg whites ~ about 5 large egg whites (at room temperature); 1 pinch kosher salt; 1/8 tsp cream of tartar (optional. It will make the meringue stronger, especially if you have older, weaker egg whites); 3 tbsp cold water; 1 1/4 cups (250g) superfine sugar (how to make superfine sugar); 1 tbsp plus 1 teaspoon cornstarch; 1 tsp vanilla extract; 1 tsp vinegar (white wine, cider or distilled); 1 recipe Perfect Whipped Cream; 1 cup Lemon Curd (divided); Fresh Raspberries and / or Passion Fruit (for filling and topping); Confectioners' sugar (for dusting)