INGREDIENTS
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8 tablespoons (4 ounces/115g) unsalted butter, cubed
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2 tablespoons unsweetened cocoa powder, plus more for the ramekins
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6 generous tablespoons dulce de leche (see note)
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1 scant teaspoon flaky sea salt, preferably fleur de sel
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8 ounces (225g) bittersweet or semisweet chocolate, chopped
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6 tablespoons (90g) packed light brown sugar
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4 large eggs