INGREDIENTS
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4 1/2 cups milk
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1 cup sugar
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1/3 cup cornstarch
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Kosher salt
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5 large egg yolks, beaten
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2 cups mascarpone cheese, at room temperature
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1/2 cup prepared espresso, at room temperature
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1/4 cup coffee liqueur
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One 11-ounce box vanilla wafer cookies
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6 ripe bananas, sliced into 1/4-inch rounds
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Unsweetened cocoa powder, for dusting