1 (6 ounce) can tuna
1/4 cup diced celery
1/4 cup chopped fresh dill weed
2 tablespoons chopped fresh parsley
2 tablespoons thinly sliced green onion
2 tablespoons fat-free mayonnaise
2 tablespoons plain low-fat yogurt
1/2 teaspoon prepared Dijon-style mustard