Ingredients:

• 8 large egg whites
• 1/2 teaspoon cream of tartar
• 1 3/4 cups (350g) granulated sugar
• 3 cups cold heavy cream
• 3 tablespoons powdered sugar
• 1 teaspoon vanilla extract
• 1/2 teaspoon salt
• 8 cups (2 pounds) mixed fresh berries, such as strawberries, raspberries, blueberries, and blackberries