2/3 cup plain yogurt
fat-free, I used my favorite Greek yogurt. If you can't find it, there are links in that post for how to strain yogurt or make your own Greek yogurt.
1/3 cup mayonnaise
I used full-fat mayo, but you can use reduced fat
2 tbsps capers
drained and finely minced
3 tbsps relish
dill pickle, or use finely chopped dill pickles