INGREDIENTS
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2/3 cup unsweetened cocoa powder
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1/3 cup all-purpose flour
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2 teaspoons instant espresso powder
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3/4 teaspoon sea salt
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4 eggs at room temperature, separated
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1 cup white sugar
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1 tablespoon water
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1/2 cup unsalted butter, melted
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2 teaspoons vanilla extract
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2 cups whole milk, lukewarm
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1 teaspoon cream of tartar