How do they get the ribbons/swirl into ice cream?

Question

How do they get those perfectly thin and wide ribbons of chocolate or fruit swirl into icecream? It seems like if they did it when pouring the mix, it would dissolve or mix into it. How do they do it?

Answer 1

You just add it the last few seconds while the machine is still moving. Or you can marble it in the container once the ice cream is done.

Answer 2

It's folded in, just before mix freezes solid

Answer 3

What?