Separate your 4 large eggs. Here's how to separate eggs. In a clean, dry bowl, whisk the egg whites until stiff peaks form.
Gradually add the 1 cup of white sugar, one tablespoon at a time, while continuing to whisk until the meringue is glossy and smooth.
Sift in the 1 Tbsp of cornstarch, pinch of salt, and 1 tsp of white vinegar, and gently Fold them into the meringue until just combined.
Spoon the meringue onto the prepared baking sheet, forming small nests about 7.5 cm (3 inches) in diameter.
Create a slight indentation in the centre of each nest to hold the topping.
Bake for about 1 hour, or until the meringues are dry and crisp on the outside but still slightly soft in the centre.
Turn off the oven and leave the meringues inside to cool completely.
In a separate bowl, whip the 2 cups of thickened cream, ¼ cup of icing sugar, and 1 tsp of vanilla extract until stiff peaks form.