Step 1: Prepare the Meringue Base

1. Preheat Oven and Prepare Baking Trays: Preheat your oven to a low 100°C (210°F). This low temperature is crucial for drying out the meringue slowly and preventing it from cracking or browning too quickly. Line two large baking trays with parchment paper. Parchment paper is essential as it prevents the meringue from sticking to the baking tray and makes it easy to remove the cups once they are baked.
2. Separate Egg Whites: Carefully separate the egg whites from the yolks, ensuring no yolk contaminates the whites. As mentioned before, even a tiny speck of yolk can prevent the egg whites from whipping properly. Place the egg whites into a clean, grease-free glass or stainless steel bowl. Plastic bowls can sometimes retain grease, which can also hinder the whipping process.
3. Whisk Egg Whites with Cream of Tartar: Using an electric mixer (stand mixer or hand mixer), begin to whisk the egg whites on medium speed until soft peaks form. This means when you lift the beaters, the peaks of the egg whites will be soft and droopy. Once soft peaks form, add the cream of tartar. Cream of tartar helps to stabilize the egg whites and ensures a sturdy meringue. Whisk for another minute until just combined.
4. Gradually Add Sugar: Gradually add the caster sugar, one tablespoon at a time, while continuing to whisk on medium-high speed. Adding the sugar gradually allows it to dissolve properly into the egg whites and prevents the meringue from deflating. Whisk continuously until all the sugar is incorporated and the meringue is glossy, stiff, and holds firm, sharp peaks. This stage is crucial for a successful meringue. The meringue should be thick and glossy, and when you lift the beaters, the peaks should stand straight up without drooping. Rub a little of the meringue between your fingers; you shouldn’t feel any sugar granules. If you do, continue whisking until the sugar is fully dissolved.
5. Incorporate Vanilla Extract: Gently fold in the vanilla extract using a spatula. Folding ensures that you don’t deflate the meringue at this stage. Fold until the vanilla extract is just incorporated and the meringue is evenly flavoured.

Step 2: Shape and Bake the Meringue Cups

1. Prepare Piping Bag (Optional): If you want perfectly shaped cups, transfer the meringue to a piping bag fitted with a large round tip (or a star tip for a decorative edge). Piping bags give you more control over the shape and size of the cups. If you don’t have a piping bag, you can simply use a spoon to shape the meringue cups.
2. Pipe or Spoon Meringue onto Baking Trays: Pipe or spoon mounds of meringue onto the prepared baking trays, leaving about 2-3 inches of space between each mound. For each cup, pipe or spoon a circle of meringue about 8-10cm (3-4 inches) in diameter. Then, using the back of a spoon, gently create a well in the centre of each meringue circle to form a cup shape. You can make the walls of the cups as high or as low as you prefer. The deeper the well, the more filling your cups will hold.
3. Bake Low and Slow: Bake in the preheated oven for 60-75 minutes, or until the meringues are crisp and dry. The baking time will depend on the size and thickness of your meringue cups. The meringues should be firm to the touch and sound hollow when tapped gently on the base. If they are still soft or sticky, they need to bake for longer.
4. Cool Completely in Oven (Crucial Step): Once baked, turn off the oven and leave the meringue cups inside the oven with the door slightly ajar for at least 1 hour, or preferably until completely cool. This is a crucial step to prevent the meringues from cracking due to sudden temperature changes. Cooling them slowly in the oven allows them to dry out completely and become crisp. Do not rush this step!
5. Carefully Remove from Baking Trays: Once completely cool, gently peel the meringue cups off the parchment paper. Meringues are delicate, so handle them with care. If they are properly baked and cooled, they should come off the parchment easily.

Step 3: Prepare the Whipped Cream Filling

1. Chill Bowl and Beaters: Place your mixing bowl and whisk attachment (or beaters if using a hand mixer) in the freezer for 10-15 minutes to chill them thoroughly. Cold equipment helps the cream whip up to a greater volume and hold its shape better.
2. Whip Heavy Cream: Pour the chilled heavy cream into the chilled bowl. Whip on medium speed until soft peaks form.
3. Add Icing Sugar and Vanilla Extract: Gradually add the sifted icing sugar and vanilla extract to the whipped cream. Continue whipping on medium-high speed until stiff peaks form. Be careful not to overwhip, as this can cause the cream to become grainy or curdle. You want stiff peaks that hold their shape but are still smooth and creamy.

Step 4: Assemble and Decorate

1. Fill Meringue Cups: Just before serving, spoon or pipe the whipped cream into the cooled meringue cups. Do not fill the cups too far in advance, as the moisture from the whipped cream can soften the meringue over time.
2. Top with Fresh Berries: Arrange your selection of fresh berries on top of the whipped cream. Get creative with your arrangement to make them visually appealing.
3. Optional Decorations: If desired, sprinkle with sprinkles, mini chocolate eggs, edible flowers, or lemon zest for extra decoration and visual appeal.
4. Serve Immediately: Serve the Easter Meringue Cups immediately for the best texture and flavour. The crisp meringue and creamy filling are best enjoyed fresh.