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☞ TESTER TIP: There's no way around this. (Sorry, kids.) You need an instant-read thermometer. Read the note above on why hitting the 180°F mark is crucial.
☞ TESTER TIP: Use a mason jar. The glass conducts cold quickly and you can shake it up. No mess.
☞ TESTER TIP: Speed is wicked important here. You don't want to give the ice cream a chance to melt and form ice crystals in the freezer. Your mouth will thank you.