01 - Preheat oven to 300°F. Line a baking sheet with parchment paper and draw a 9-inch circle as a guide.
02 - In a clean, dry bowl, beat egg whites with an electric mixer on medium speed until soft peaks form.
03 - Gradually add sugar one tablespoon at a time, beating continuously until stiff, glossy peaks form and sugar is completely dissolved.
04 - Gently fold in sifted cocoa powder, white vinegar, and chopped dark chocolate using a rubber spatula with careful strokes.
05 - Spoon the meringue mixture onto the prepared circle, smoothing the sides and creating a slight well in the center.
06 - Bake for 1 hour 15 minutes. Turn off the oven, leave the door slightly ajar, and allow the meringue to cool completely inside the oven.
07 - Whisk heavy cream with powdered sugar and vanilla extract until soft peaks form.
08 - Transfer cooled meringue to a serving platter. Top with whipped cream, scatter fresh raspberries over the surface, and finish with dark chocolate shavings.
09 - Serve immediately to maintain optimal texture and freshness.