To feed the Porker you must collect items from the Feeding Grounds. The items you can feed the Porker are Addled Egg, Bread Crust, Flaccid Salad, Old Meat, Potato Peelings, and Rotten Tomatoes.
I was wondering how do these items spawn within the Feeding Grounds? Will they spawn on your screen if you wait or will it block the spawn? Does killing the orgers affect the spawn rate of these items? Is it just random around the cave?