Whisk together ground coffee and cold water in a small bowl. Cover with plastic wrap and set aside for 12 hours. Whisk, then strain through a funnel lined with a moistened paper towel into a bowl.
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Place ice cream scoops in 2 coffee or espresso cups. Pour 1/4 to 1/2 cup cold coffee over the top of each. Garnish with shaved dark chocolate.
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