INGREDIENTS
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2 tablespoons unsalted butter
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2 tablespoons all-purpose flour
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1 cup whole milk
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8 ounces dark chocolate, roughly chopped
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1 1/2 ounces unsweetened chocolate, roughly chopped
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1 teaspoon espresso powder
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1/2 teaspoon vanilla
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5 tablespoons sugar, divided
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4 eggs, separated and room temperature
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1 teaspoon kosher salt
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Crème fraiche for serving
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1 cup organic heavy cream
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2 tablespoons plain whole milk yogurt or buttermilk