Preheat oven to 350 degrees. In the bowl of an electric stand mixer fitted with the whisk attachment, beat egg whites until foamy.
Add vinegar and salt and beat on medium-high to soft peaks.
Slowly add sugar, about a tablespoon at a time, beating on high until whites are stiff and shiny.
Add vanilla and lime zest then sprinkle cornstarch over whites and beat until incorporated.
On a parchment paper-lined baking sheet, pipe or spoon meringue into a 10-inch circle, making sides higher than the center.
Place in oven and turn heat down immediately to 300 degrees. Bake 45 minutes and then turn oven off, leaving meringue in for an additional 40 minutes, or until crisp.
Take out of the oven and cool. When completely cooled, remove meringue by gently peeling it off the parchment or by sliding an offset spatula or knife underneath the shell.
With an electric mixer, whip cream and sugar until you have stiff peaks. Chill until ready to use.
Place sliced kiwis in a medium bowl.
Add lime juice, sugar, mint and rum, if using, and gently toss. Let macerate for 30 minutes, or up to 24 hours.
Fill Pavlova shell with whipped cream and top with macerated kiwis.
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