Rinse dill, remove tough stems and chop finely. Peel the eggs from the shell and chop.
Remove tough outer fibers from the celery stalks, this is best done with a paring knife. Cut the celery into small cubes.
Place celery, eggs and dill in one bowl. In another, mix yogurt, mayonnaise, olive oil, salt and pepper. Add dressing to vegetables and refrigerate for 1 hour.