Meringue: Preheat the oven to 100C (- max 150C) and line a baking tray with parchment. Combine egg whites and in a mixing bowl fitted with whisk attachment. Whip until stif peak form, about 5min, then add in sugar slowly while whipping. Beat until combined then add vanilla and salt, vinegar and cornstarch at the end.
2
Fill a large star tipped pastry bag and pipe nest shapes, about 3 inches in diameter, of meringue onto prepared pan (or drop large spoonfuls with a spoon). Place pan in oven to dry for 30min until crisp. Cool down until ready to use.
3
Filling: Melt sugar and water over medium high and add blueberries. Cook for about 5min, stirring occasionally until they begin to split open and it starts to look like jelly. Add the lemon juice and reduce heat to medium low. Simmer, still stirring occasionally for about 10min until the it has begun to thicken.
4
Pavlovas: When the meringue nests are done and filling is cooled, fill each one with a spoonful of ice-cream and pour blueberry topping and additional fresh blueberries on top if desired.