Preheat the oven to 320°F (160°C). Line a 12x16-inch baking sheet with parchment paper.
In a clean mixing bowl, beat egg whites until soft peaks form. Gradually add sugar, one tablespoon at a time, beating until glossy stiff peaks form.
Fold in vinegar, cornstarch, and vanilla extract gently until just combined.
Spread the meringue evenly on the prepared baking sheet. Bake for 25–30 minutes, or until lightly golden on top and firm to the touch.
Let it cool in the pan for 5 minutes, then invert onto a fresh sheet of parchment dusted with powdered sugar. Remove the baking parchment.
Whip the heavy cream with powdered sugar and vanilla until soft peaks form.
Spread the whipped cream over the cooled meringue and scatter with fresh raspberries.
Carefully roll the meringue from the short end, using the parchment to help guide the roll.
Transfer to a serving platter, dust with powdered sugar, and chill before serving.