There are a few ways to do that:
If you’re looking for a "southwest type sauce" (like Carl’s Jr. uses on their Southwest Burger items, it’s as simple as taking 1 cup of mayo and adding a taco seasoning (available in the grocery spice aisle, where the packaged gravies are located)
I live in Southern California, and both Best Foods and Kraft have a Mayo con Lima (mayo with lime) but it’s only available in certain market areas.
You can also make your own by adding to one cup (8 oz) of mayo:
Ground Cumin
Ground Coriander seed (that’s from where cilantro comes)
Cayenne pepper
Lime/Lemon juice
As far as proportions, this is an "experimentation" of YOUR particular taste. The "a little of this, a little of that" comes into play here. Just remember to WRITE down what/what proportions you made it with, or be beleaguered by guests who wanted the "recipe" that really only exists in your head (this happened to me 2 years ago T”giving, I made some Balsamic Bacon Brussels Sprouts……They were the RAVE, but I didn’t write down ANYTHING………Oppps…….
Christopher K.
