Ingredients are of course just like it says. Whatever is the refrigerator that needs using up is fair game. This is a very fun a creative use of “left-overs”. If you wish to keep it cold, then focus on left over pasta salad, beans, rice and vegetables. If hot, the same thing, maybe with more of an emphasis on dishes that were originally served hot. If this is the case, add water and heat to boiling. (Never use a microwave). You can then add other items to extend the dish to feed the requisite numbers of people. Experiment and have fun.