INGREDIENTS
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6 ounces egg whites (2/3 cup; 170g), from 5 to 6 large eggs
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9 ounces plain or lightly toasted sugar (1 1/4 cups plus 1 tablespoon; 255g) (see note)
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1/4 teaspoon Diamond Crystal kosher salt; use half as much if iodized
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1/4 teaspoon cream of tartar
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Scraped seeds from 1 split vanilla bean (optional)