INGREDIENTS
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1/2 cup (125ml) espresso, at room temperature
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2 tablespoons dark rum
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1 tablespoon cognac
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2 large eggs, separated, at room temperature
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pinch of salt
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7 tablespoons (90g) sugar, divided
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1 cup (250g) mascarpone
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twelve 3½-inch ladyfingers (70g, or 3 ounces)
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optional: 1 ounce (30g) bittersweet chocolate
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unsweetened cocoa powder, for serving