INGREDIENTS
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1 cup (2 sticks) unsalted butter
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2 tablespoons unsweetened cocoa powder
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1 cup brewed coffee
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2 cups all-purpose flour
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1 1/3 cups granulated sugar
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1 teaspoon baking soda
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1/2 teaspoon salt
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2 eggs
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1 teaspoon vanilla extract
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1/2 cup plain greek yogurt
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2 1/4 cups sweetened condensed milk (I used about 1 1/2 (14oz) cans)
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4 ounces dark chocolate, chopped
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6 egg whites
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3/4 cup + 2 tablespoons superfine sugar
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1 1/2 teaspoons white vinegar
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3 teaspoons corn starch
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1 1/2 tablespoons unsweetened cocoa powder
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1/2 cup dark chocolate, melted
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powdered sugar, for dusting