1 tbsp Instant chopped onion
1/4 cup chopped celery
1/4 tsp Imitation butter-flavored salt
1/8 tsp black pepper
1 tbsp water
1 (6 and 1/2 oz) can diet tuna
1/8 tsp dry mustard
2 tbsp low cal mayonnaise
Combine onion and water. Let stand 5 minutes. Drain and flake tuna. Add celery to onion. Combine remaining ingredients. Mix thoroughly. Add mayonnaise mix to tuna mix and toss lightly to mix well.