1/2 cup mayonnaise
1 1/2 tablespoons green onions; finely chopped
1 1/2 tablespoons celery; finely chopped
2 teaspoons flat-leaf or Italian parsley; finely chopped
2 teaspoon Dijon mustard
1 teaspoon prepared horseradish
1/4 teaspoon garlic; minced
1/2 teaspoon Worcestershire sauce
1/4 teaspoon freshly ground black pepper
1/4 teaspoon salt

Mix all of the ingredients well and chill before serving.