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Preheat oven to 300 degrees F (150 degrees C). Line a baking sheet with parchment paper. Draw a 9-inch circle (you can also do four 3-inch circles for mini pavlovas) on the parchment paper and flip markings to be on the bottom side of the paper.
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In a large bowl, beat egg whites and cream of tartar until foamy.
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Gradually add in the sugar, 1 tablespoon at a time, beating well after each addition. Beat until thick and glossy. Over-beaten egg whites lose volume and deflate when folded into other ingredients. (Be absolutely sure not a particle of grease or egg yolk gets into the whites.)
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Gently fold in vanilla extract, lemon juice and cornstarch.
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Spoon mixture inside the circle drawn on the parchment paper.
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Working from the center, spread mixture toward the outside edge, building edge slightly. This should leave a slight depression in the center.
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Bake for 40 minutes. When done, crack oven and allow to cool slightly before removing