Step 1: Prepare the Macaron Shells
Preheat the oven to 300°F (150°C) and line two baking sheets with parchment paper.
Sift the powdered sugar and almond flour together into a large bowl to remove any lumps.
In a separate bowl, beat the egg whites with a pinch of cream of tartar until soft peaks form.
Gradually add the granulated sugar while continuing to beat until stiff peaks form. The meringue should be glossy and hold its shape.
Gently fold the sifted almond flour and powdered sugar mixture into the meringue. Use a spatula and fold carefully until the mixture reaches a ribbon-like consistency.
Add the rosewater and a drop of pink food coloring if desired, then fold gently to combine.
Transfer the batter to a piping bag fitted with a round tip. Pipe small, uniform circles (about 1 inch in diameter) onto the prepared baking sheets.
Tap the baking sheets on the counter to release any air bubbles, and let the macarons sit at room temperature for 30-60 minutes to form a skin.
Bake in the preheated oven for 15-18 minutes, or until the macarons easily peel off the parchment paper. Allow them to cool completely on the baking sheets.
Step 2: Prepare the Raspberry Rose Buttercream
In a stand mixer or using an electric mixer, beat the softened butter until light and fluffy.
Gradually add powdered sugar, 1 tablespoon at a time, and beat until smooth.
Add raspberry puree, rosewater, and a pinch of salt, and mix until fully combined. Taste and adjust the rosewater for a more prominent floral flavor if desired. Set aside.
Step 3: Assemble the Macarons
Pair up macarons of similar size.
Spread a layer of raspberry rose buttercream on the flat side of one macaron shell.
Add a small dollop of raspberry jam on top of the buttercream, then place another macaron shell on top to form a sandwich.
Repeat the process with the remaining macarons.
Step 4: Drizzle with White Chocolate
Place the white chocolate in a heatproof bowl over a double boiler or melt in the microwave in 20-second intervals, stirring between each.
Once melted, transfer the white chocolate to a piping bag or small plastic sandwich bag with the tip snipped off.
Drizzle the white chocolate over the assembled macarons in a zigzag pattern.
Allow the chocolate to set at room temperature, or refrigerate the macarons for 10-15 minutes to speed up the process.