INGREDIENTS
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3/4 cup/180 milliliters boiling water, or use hot coffee, Earl Grey tea or mint tea
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1/4 cup/25 grams unsweetened cocoa powder (Dutch-processed or natural)
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1 to 2 ounces chopped bittersweet chocolate (optional)
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2/3 cup/160 milliliters mayonnaise
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1/4 teaspoon kosher salt
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1 1/2 teaspoons baking soda
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3/4 cup/150 grams granulated sugar
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1 teaspoon vanilla extract, or a dash of bourbon or whiskey (optional)
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1 1/2 cups/190 grams all-purpose or cake flour
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Confectioners’ sugar, for finishing