When I put leftover homemade ice cream in the freezer, it freezes into one big chunk. How can I avoid this?

homemade icing image

_auntpete

I have been making homemade ice cream for years. And this is the ONLY drawback.
I was once told by a neighbor that there was a simple ingredient you could add to the mixture to keep the ice cream's consistency the same, even after freezing, but I can't remember what it was.

Answer
You need to get more air into the ice cream while you are making it.