No, I have never made tartar sauce before today.
In fact, I don't even like tartar sauce.
Tartar sauce of course is not cooked in cast iron, because it's not cooked at all.
I used olive oil mayonnaise, because I despise real mayonnaise. You can use real mayo if you want; that's what the normal recipe calls for.
Add chopped green olives, minced onions, chopped parsley, dill pickle relish*, capers.
*the recipe called for "your choice of pickles" so I'm sure sweet pickle relish would be fine.
Also add lemon, or lime juice. I used lime juice.
Mix it all together and chill.
I liked this tartar sauce, and I normally don't like tartar sauce. So that should tell you something.