Boil a package of shell macaroni, drain and cool.
Chop celery, red onion, carrots. (I use about four good size carrots, 4-5 good sized stalks of celery and one medium red onion.)
Drain a large can of tuna 12oz. or two small cans 6oz.
Toss it all together with mayo! Salt and pepper to taste. YUM!