INGREDIENTS
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2 1/2 cups strong brewed coffee, room temperature
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9 tablespoons dark rum, divided
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1 1/2 tablespoons instant espresso powder
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6 large egg yolks
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2/3 cup sugar
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1/4 teaspoon salt
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1 1/2 pounds (3 cups) mascarpone
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3/4 cup heavy cream, chilled
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14 ounces dry ladyfingers (Savoiardi), divided
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3 1/2 tablespoons Dutch-processed cocoa, divided
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1/4 cup grated semisweet or bittersweet chocolate (optional)