This is from David Lebovitz's wonderful book "The Perfect Scoop." If you make ice cream at home, you gave to have this cookbook! He advises to add this to ice cream this way: coat the bottom of your container with fudge ripple, then add ice cream, layering it with generous amounts of ripple. Don't mix or you'll have muddy ice cream instead of rippled ice cream. My experience is that I need to harden my ice cream or frozen yogurt for an hour or so before l do this, and that the ripple should be really cold-- in fact, it's best if I make the ripple a day or two in advance.