Tartar sauce is a variation of sauce Remoulade. Google. Capers, shallots and gherkins or cornichon pickles in an aioli (or Mayo, not miracle whip) spiked with herbs including dill and sometimes tarragon, or whatever, usually hit with lemon juice more so than cider vinegar or any vinegar.
Thank you Chef.
Probably the tarragon and dill in it. Not my favorite herbs. Don't even put them in the garden I like them so little.