6 ounces bittersweet chocolate, roughly chopped |
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1 stick (1/2 cup) unsalted butter, room temperature, plus 1 tablespoon, melted |
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1/4 cup sugar, plus more for coating the ramekins |
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1 teaspoon pure vanilla extract |
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1 teaspoon instant espresso powder |
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2 large eggs, plus 2 large egg yolks |
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2 tablespoons all-purpose flour |
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