1 cup low-fat mayonnaise
2 tsp Dijon mustard
1/2 cup grated carrots
1 cup diced celery
4 Tbsp pickle relish
7 cans (6 ounces each) water-packed tuna fish, drained well
Combine all the ingredients (adding salt and pepper to taste) in a large bowl. Chill 3 hours before serving or let chill overnight.
(For those of you counting points, each serving is 3.)