An American tradition. Seriously one of the easiest things to make with simple ingredients.
Elbow macaroni
Mayonnaise
Vinegar
Sugar
Salt
Black pepper
Thinly sliced celery
Onions
(Pepper is optional. I don't put it in mine.)
Cook macaroni like you would pasta. Drain it. Cool it. Put it in a bowl and add mayonnaise, vinegar, sugar, salt and onions. Stir and then cover up and put it in the fridge. Ta-da