Preheat oven to 350°F. Line a baking sheet with parchment paper and draw a 9-inch circle on it.
Mix together the sugar, coffee and cocoa and set aside.
In a metal or glass mixing bowl (make sure it is completely clean and dried) beat the egg whites with an electric hand mixer or stand mixer until you can form soft peaks. Keep beating and add the sugar/coffee/cocoa mixture one tablespoon at a time. 
When mixture is glossy, firm, and forms stiff peaks fold in the cornstarch and vinegar.
Dollop the pavlova mixture in the middle of the circle on the baking sheet, smoothing to the edges and so that it is flat on top.
Place pavlova in the hot oven. Immediately reduce heat to 300°F. Bake for 1 hour, turn off the oven, crack open the oven door slightly and allow to cool for 45 minutes.
While pavlova is cooling, in a large cold bowl (I place mine in the freezer for 10 minutes prior to starting this), whip cream until stiff peaks are just beginning to form. Beat in the vanilla and icing sugar until peaks do form. 
Once pavlova has cooled, spread whipped cream over top. Sprinkle crushed candy canes over top. Serve and enjoy!