with pellets, I think you need an extruder of some sort like a those meat grinders. You need to make the food consistency to something like dough.
With flakes, you spread the food on parchment paper and put in the oven to dry. I'd go with agar. It's more shelf stable than gelatin.
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Last edited by mistergreen; 05-28-2013 at 12:26 AM.