Preheat Oven: Begin by preheating your oven to 150°C (300°F).
Prepare Meringue Base: In a clean, dry bowl, beat the egg whites until stiff peaks form. Gradually add the golden caster sugar, beating continuously until the mixture becomes glossy.
Shape Meringue: Line a baking tray with parchment paper. Spoon the meringue onto the tray, forming a circle about 23cm in diameter. Using a spatula, create a shallow well in the center.
Bake: Bake in the preheated oven for about 1 hour, or until the meringue is crisp and slightly golden. Turn off the oven and let the meringue cool completely inside.
Prepare Filling: In a bowl, mix mascarpone, vanilla extract, fromage frais, and the rounded dessertspoons of golden caster sugar until smooth.
Assemble Pavlova: Once the meringue is cool, spread the mascarpone filling over the base. Top with hulled strawberries and a light dusting of icing sugar.