1 (6 oz.) can shrimp pieces
2 green onions with tops, chopped fine
1/4 c. finely chopped celery
1/4 c. salad oil
1 lg. tomato
2 tbsp. lemon juice
1 tbsp. prepared mustard
1/2 tsp. salt
1/4 tsp. pepper
1 med. head shredded lettuce

Combine shrimp, onions and celery. Mix salad oil and lemon juice in a bowl and add seasonings. Blend thoroughly with a fork. Pour mixture over shrimp and toss well. Cover and refrigerate to marinate for 2 hours. Mix lightly but thoroughly and toss with shredded lettuce and tomato. Garnish with tomato wedges.