Whenever I would eat in fastfoods outlets, the dip they give me is either ketchup or mayonnaise, depending on the fastfood outlet. One time we cooked fries at home and I thought of an idea - why not mix ketchup and mayonnaise? My experiment was quite good. And it did not stop on that. I would be adding more ingredients to my special dip. Worcestershire sauce is a good flavoring and to liven up the bland taste of mayonnaise, a dash of salt and pepper would do the trick. I'm sure you will like that special dip of mine.