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I found this on my first try. It is posted on a Wordpress blog -- thinkingunderage.wordpress -- page at http://thinkingunderage.wordpress.com/2006/12/17/zaxbys-secret-sauce-recipe%E2%80%93-revealed/
Zaxby’s “Zax” Sauce:
(Add secret ingedients Season All, honey mustard, and a little dr.pepper.)
Mix together the mayo, ketchup and garlic powder blending well.
Refrigerate for at least two hours prior to use to allow the flavors to mingle.
Have fun with it, Heidi. It is mainly mayo and ketchup, but it sounds good. Some like beaten egg yolks instead of mayo.
Site given has another version. A commenter gives this recipe:
"zax sauce is easy to make...1 c. ketchup, 1 c. good quality mayo, one small can of anchovies in olive oil (dont drain) 1 large glove garlic, LOTS of black pepper, a squeeze of lemon juice and mix in blender or food processer. Put in fridge for at least an hour and there you have it! Dont be afraid of the anchovies. if its too strong for you double everything except the anchovies."
So there you have it. You pays yer money and you takes yer choice, to coin a phrase.