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Place an oven rack in the lower third of your oven, then preheat oven to 250 degrees. Draw a 9-inch circle on a piece of parchment paper (I traced around a 9-inch cake pan). Flip the paper over and place on a large baking sheet—you should be able to see the circle. If you can’t, retrace with a bolder pen.
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Combine the sugar and cornstarch in a small mixing bowl. Combine the vanilla, vinegar, and cardamom in another small mixing bowl.
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Place the egg whites and salt in a large mixing bowl and beat with an electric mixer set to low. Gradually increase the speed to medium. Whisk on medium until the whites hold soft peaks, about 1 to 2 minutes.
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Begin adding the sugar-cornstarch mixture a few tablespoons at a time, while increasing the mixer’s speed to high. Continue beating until the whites hold stiff peaks, several minutes more.
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Pour the vinegar, vanilla, and cardamom over the meringue, then beat for another 20 seconds to combine.
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Mound the meringue in the center of the circle on your prepared parchment. Use a rubber spatula to smooth it out to the edges of the circle, making an even round.
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Bake until the pavlova is firm to the touch, about 60 to 70 minutes. Avoid opening the oven during baking, except at the end to test for doneness. Cool completely on a wire rack before filling.