1Cook macaroni according to package directions;
Meanwhile,cut a thin slice off the top of each tomato.
Scoop out pulp,leaving a 1/2" shell...Invert tomatoes on paper towels to drain.
Drain macaroni and rinse in cold water.
In a bowl,combine macaroni,ham,cheese and celery.
2In a small bowl, combine mayonnaise,sour cream,onion powder,and pepper.
pour over salad and stir to coat.
spoon into tomato cups.
Serve on a lettuce-lined plate if desired with any additional salad on the side.