Custom Recipe - Food Hand Prop

I have my custom recipe working and ready however, I can not find any tutorials or help on how to change the food prop in the sims hand when they eat. I changed the instance number of the hand prop to my base recipe and started the tuning but I can not find any resources to further help me. For the tuning I changed the name and tuning id but that is as far as I got since I am unsure what to do next. I have worked with object tuning before but not with recipes and not on a scale like this. Any help would be much appreciated!