In making fish and chips the other night this is what I whipped up for a tartar sauce. It does need at least 30 minutes for the flavors to meld, an hour is even better.
Homemade Tartar Sauce
1/2 cup mayonnaise
1/2 cup diced dill pickles (well drained)
1 Tbsp lime (or lemon) juice
1 Tbsp honey Dijon mustard
1 Tbsp dried onion
1/4 tsp fresh ground black pepper
Mix together well and stash in the refrigerator for at least 30 minutes. Excellent the next day as a sandwich spread for fishwiches.