In a small to medium sized mixing bowl stir together the mayo, relish, herbs, lemon juice and sugar.
You can store any leftover tartar sauce in an airtight container in the refrigerator or at least a week but likely longer.
Notes
You can swap regular mayo or Miracle Whip or another low-fat option if you prefer. If you want to make this vegan friendly use a vegan mayonnaise like Vegenaise.
Instead of dill relish you can finely chop up dill pickles for this. If you do this will make the sauce thicker and more chunky in consistency.
You could swap the dill relish or sweet relish. If you do I recommend omitting the sugar as it won’t be necessary to balance the flavors.
If you don’t have fresh lemon juice you could use apple cider vinegar or white vinegar instead.