FIRST STEP:
Cook macaroni according to package directions, rinse, cool and set aside
Cut hard boiled eggs in half and put yolk into a separate bowl
SECOND STEP:
Chop the egg whites and add to the macaroni bowl
Add in the chopped onion and sliced celery
THIRD STEP:
Mash the egg yolks with a fork
Add the mustard, ketchup, mayonnaise, sugar and vinegar and combine well
FOURTH STEP:
Stir this sauce into the macaroni bowl and combine well
Garnish with green onion and serve
Enjoy!