Delicious dirty lunch

I went out for a bike ride and was gone longer than I had planned to be.  When I got home, my wonderful children were making lunch!  Noah made macaroni and cheese, and Sarah made a salad with lettuce, celery, tomatoes, and cranberries.  When I had eaten most of my salad, she said, "Oh, I'm sorry I forgot to wash the lettuce."  I asked if she washed the tomatoes, and she said no.  I knew I didn't want to know, but I had to ask.  "How about the celery?"  She shook her head.