Somebody asked "What did Jesus do with the leftovers?"
It doesn't say.
Does that mean it's not important? Good possibility! Or at least it doesn't matter in this story. Is there a story where using what you have or not wasting, or not throwing away or...pick a word or phrase...is there a story in scripture about that? Remember the story of the manna and the people were only supposed to take what they would use and the rest rotted? Not exactly the same but similar.
What could he have done with the leftovers?
Another thing to do (unless you're using the method that just looks at the text and doesn't look elsewhere - forgot what it's called) is take a word like "waste" or "left" or "left over," do a word study and see where it takes you.