I've actually tried this, and it really works!
- Ingredients
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- 2 tablespoons sugar
- 1 cup half and half
- 1/2 teaspoon vanilla extract
- 1/2 cup salt (The bigger the granules, the better. Kosher or rock salt works best, but table salt is fine.)
- Ice cubes (enough to fill each gallon-size bag about half full)
- 1 pint-size ziplock bag
- 1 gallon-size ziplock bag
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- Instructions
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Combine the sugar, half and half, and vanilla extract in the pint-size bag and seal it tightly.

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Place the salt and ice in the gallon-size bag,
then place the sealed smaller bag inside as well. Seal the larger bag.
Now shake the bags until the mixture hardens (about 5 minutes). Feel the
small bag to determine when it's done.
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Take the smaller bag out of the larger one, add
mix-ins, and eat the ice cream right out of the bag. Easy cleanup too!
Serves 1.
Yummy treat for a hot day, and it takes less time than going to an ice cream shop!