It’s not related to any of my crazy business ideas. I ate a Korean ice-cream sandwich today and it was undeniably ice cream but also about four times lighter th

It’s not related to any of my crazy business ideas. I ate a Korean ice-cream sandwich today and it was undeniably ice cream but also about four times lighter than, say, a Magnum. Physics being not my thing, I wonder how they do that. More air, I guess, but how?