01 -
Preheat the oven to 225°F (110°C) and line two baking sheets with parchment paper.
02 -
In a clean mixing bowl, whisk the egg whites on medium speed until frothy. Add the cream of tartar and continue whipping.
03 -
Gradually add the superfine sugar, beating at high speed until stiff, glossy peaks form.
04 -
Gently fold in the vanilla extract, lemon zest, and poppy seeds until well combined.
05 -
Pipe or spoon 2-inch rounds of the meringue mixture onto the prepared baking sheets, ensuring an even shape. Place trays in the oven and bake for 90 minutes. Turn off the oven and allow the meringues to cool completely inside.
06 -
In a saucepan over low heat, whisk together the egg yolks, granulated sugar, fresh lemon juice, and lemon zest. Stir constantly until the mixture thickens and coats the back of a spoon.
07 -
Remove the saucepan from heat and whisk in the unsalted butter until smooth. Pour the curd into a bowl, cover, and chill in the refrigerator until set.
08 -
Whip the cream or mascarpone cheese to soft peaks and refrigerate until ready to use.
09 -
Carefully pair meringues by size. Spread a layer of lemon curd and a dollop of whipped cream or mascarpone on the flat side of one meringue, then sandwich with another. Repeat for remaining meringues.
10 -
Serve immediately or refrigerate briefly before serving for best texture.