Making a mayonnaise alternative?

My wife hates mayonnaise, she has a literal aversion to it, but I see it as essential to some recipes. There is a Bahn mi restaurant near us that makes their vegetarian (or possibly vegan) mayo that my wife said she actually doesn't mind.

We were looking at what we want to make to eat over the next few days and one of our options was a vegetarian BLT (I'm a vegetarian), but this is one of those recipes that I feel like mayonnaise is essential for. Yes, she can just go sans mayo, but I also want her to be able to enjoy the sandwich instead of suffering through the thing dry.

Does anyone here with general mayonnaise aversions have a vegan or vegetarian mayonnaise recipe they would be willing to share? Thanks in advance.

I can DM a link to the BLT recipe if anyone wants that context.