In a pinch when out of tartar sauce I’ve mixed green relish with mayo and it’s, passable.
For that matter, mayo with hot sauce and ketchup was my accompaniment to some otherwise bland pizza and tater tots this afternoon.
Microwave Hollandaise sauce. Can go wrong easily, but when I wanted it quick it works fairly well. Just have to tend the microwave every 15-20 seconds to mix it before it coagulates. But it’s done its job more than once for me.
I mix Frank’s wing sauce and Mayo for my breakfast sandwiches.
Frank’s wing sauce and ranch for lunch wraps.
Frank’s wing sauce and sour cream makes a good dipping sauce too.
Stick chipotles in adobo into a blender then mix with mayo.
Just as a funny aside, the hot sauce I used in my pizza/tots dip today was Franks. (Not the wings sauce though TBF.) Someone gave me a tonne of packets of it and ketchup and some single-serve cheeze wiz I’ve been using in various ways.