Chocolate Pavlova with Mascarpone Cream & Raspberries

Name: Chocolate Pavlova with Mascarpone Cream & Raspberries
Prep time: 20 min
Cook time: 70 min
Total time: 90 min
Yield: 10
Ingredients: For the Pavlova:; 6 large egg whites; Pinch salt; 1¾ cups superfine sugar (see note); 3 tablespoons natural unsweetened cocoa powder, such as Hershey's; 1 teaspoon red wine vinegar; 2 ounces bittersweet chocolate, finely chopped; For the Marscapone Cream:; 8 ounces (1 cup) mascarpone cheese, cold; 1½ cups heavy whipping cream, cold; ¼ cup sugar; 1 teaspoon vanilla extract; For the Topping:; 1½ cups fresh raspberries; 2 ounces bittersweet chocolate, grated or shaved into curls (optional)