Preheat the oven to 350°.
In a mixer fitted with a whisk attachment (or using a hand mixer), whip the egg whites, cream of tartar and salt in a clean, dry bowl until foamy. Add the granulated sugar, cornstarch, vanilla and vinegar and continue whipping until stiff, smooth, and glossy, about 8 minutes more.
On a sheet of parchment paper cut to fit a sheet pan, use a pencil to draw or trace a circle 9 inches in diameter. Line the sheet pan with the parchment, pencil side down (you should still be able to see the circle). Spoon the egg whites into the circle, using the back of the spoon to smooth the top and sides of the disk.
Bake in the center of the oven for 10 minutes, then reduce the heat to 300° and bake until the meringue has puffed up and cracked on the top and the surface is lightly browned to the color of café au lait, about 45 minutes more. Turn off the oven, prop the oven door open, and let the pavlova cool in the oven at least 30 minutes, to room temperature. This ensures a gradual cooling, which protects the delicate meringue.
Whip the cream and brown sugar together until stiff. Spoon it in the center of the cooled pavlova and spread out to within ½ inch of the edge. Arrange the slices of kiwi around the edge. Arrange the slices of strawberry in the middle. To serve, slice into wedges with a serrated knife.
Chef Gale is pastry chef/partner of the newly opened Spritz Burger in Chicago, collaboration with The Hearty Boys, and partner in the Michelin one star, Tru, host of Food Network “Sweet Dreams”, and author of 8 books. She produces Gale’s Root Beer, has received two James Beard Awards, has been inducted to the Chicago Chefs Hall of Fame and is the mother of 3.