Start by making or preparing your raspberry curd in advance. I like using frozen raspberries because they give a stronger color and flavor. Cook until thick and smooth, then set aside. This step ensures the filling is ready when needed.
Preheat your oven to 350°F (175°C). Line an 8x8 baking pan with parchment paper and lightly grease it. This makes removing the bars much easier later. Keep everything ready before starting the crust.
In a food processor, combine flour, sugars, lemon zest, and cold butter. Pulse until crumbly, then press evenly into the pan. Smooth the surface using a spoon or spatula. This creates a firm base for the layers.
Bake the crust for 20–25 minutes until lightly golden. The edges should look crisp while the center remains firm. This step prevents a soggy bottom once the filling is added.
Pour the prepared raspberry curd over the warm crust. Spread it evenly so every bite has the same flavor. Return to the oven and bake until the center slightly jiggles but the edges are set.
Let the baked bars cool at room temperature first. Then refrigerate for at least 4 hours or overnight. This helps the curd fully set and makes slicing easier.
Grind freeze-dried raspberries into powder and mix with water to create raspberry liquid. Heat it with sugar until it reaches the right temperature. Meanwhile, whisk egg whites until frothy and ready.
Slowly pour the hot raspberry syrup into the egg whites while mixing. Continue whipping until stiff, glossy peaks form. This creates a stable Italian-style meringue with a smooth texture.
Spread the meringue over the chilled bars evenly. Use a spoon to create decorative peaks. Lightly torch the top until golden brown for a beautiful finish.