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You will need 2 clean lidded metal cans, one needs to be larger than the other. 1 pound and 3 pound coffee cans work great.
Into the smaller can, add...
1 cup of very cold milk
1 cup sugar
1 tsp vanilla
1 tbs. chocolate syrup
...And then seal the lid tightly
Place the smaller can in the larger coffee can. Next, place a good amount of salt along with ice around the inside of the larger can, surrounding the smaller one. Try to get the smaller can centered within the larger can. Place the lid on the larger can. Let your kids roll the can around for about a half hour, and its ready to eat!