It's sad when a tub of delicious ice cream develops ice crystals; these can even affect its flavor; that's why you should follow this super secret to know how to prevent ice formation in ice cream
When your ice cream is about halfway gone, take it out of the freezer.
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With some scissors, start cutting the cardboard box.
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Cut it down to the level of your ice cream.
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Try using the same lid from the container; if it no longer fits, try one from another airtight container or use wax paper. Done, this will prevent ice crystals from forming and you'll also save space in the freezer.