Boil potatoes until tender. Let potatoes cool to room temperature and cut into cubes. Combine all remaining ingredients with potatoes. Refrigerate until ready to serve.

8 medium red potatoes, peeled
1 cup red onion, finely chopped
1 cup celery, finely chopped
1 tablespoon yellow mustard
1/2 cup eggless mayonnaise
1/2 cup fresh dill, chopped
dash of cayenne pepper (optional)
salt and pepper to taste