Welcome to DC, otuatail!
This may not be what you're looking for - when I make tartar sauce I make it very simple:
1/2 C mayonnaise
1 Tablespoon (or more to taste) sweet pickle relish
1 Tablespoon finely minced onion, more or less to taste
1 Tablespoon lemon juice
chopped parsley - a Tablespoon or so
(Better after it sits for a while in the fridge so the flavors can blend)
I live alone and don't use it much - you could easily double it. I haven't bought bottled tartar sauce in many years.
There are some great sounding ideas here:
I need a good Tartar Sauce