Might want to take a look at http://www.blueskycreamery.com/ http://www.blueskycreamery.com/ where they've been freezing ice cream with liquid nitrogen in large

Might want to take a look at http://www.blueskycreamery.com/ http://www.blueskycreamery.com/ where they've been freezing ice cream with liquid nitrogen in large quantities (rather than the tiny spheres of Dippin' Dots) for a long time; the two founders came up with the process when they were Iowa State students back in 1999.