I don't know if there is still someone out there with a working ice box but they still sell chocolate icebox pie at the store - yum, yum, yum. Have you never had a piece of icebox pie?
You can get some chocolate icebox pie inside Mammy's Cupboard -
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Or, you can kind of follow this lady's recipe for making chocoalte icebox pie.
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Add more chocolate to the pudding filling, don't use marshmallows in the pie filling, and make enough filling to fill the pie up to the rim, then use cream whipped stiff with sprinkles of chocolate on top and let the pie set up before slicing and serving. And, it needs to be cold.
Or, you can find it ready made at the store in the freezer case.