This recipe (minus the onions and egg) was also the "secret sauce" on the burgers they made. No it isn't any chain burger joint you have heard of, but one I worked at during high school. Great salad dressing, great on burgers!

1 c. mayonnaise
1/3 c. ketchup
1/4 c. pickle relish

Can also add:
1 tbsp. chopped onion
1 hard cooked egg, chopped