Wow, I just saw this, and I have to say, this is a topic dear to my heart. I love, love making my sauce for anything from fish to burgers to fries to fried chicken. even roast beef sandwhiches.
one cup mayo. real mayo please.
two tablespoons finely chopped onion.
one tablespoon finely chopped dill pickel.
a dash of salt and pepper.
one tablespoon ketchup.
one tablespoon finely chopped parsley.
I can't think of a food this isn't good on, except the obvious ones like cake or such.