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Jack in the Box mayo-onion sauce

A recreation of this iconic sauce from Jack in the Box that was used on the Sourdough Jack, Chicken Supreme, Ultimate Cheeseburger (pre-2002) and Hot Ham and Cheese.
Cuisine American
Keyword jack in the box, mayo, onion, sauce
Servings 4


  • 1.5 tsp white vinegar
  • 1 tsp granulated sugar or corn syrup
  • 1/4 tsp onion powder
  • 1/8 tsp dry mustard powder or yellow mustard
  • 1 pinch xanthan gum optional
  • 2 tbsp mayonnaise


  • Mix the vinegar, sugar, onion and mustard until the sugar dissolves
  • Add a pinch of xanthan gum while mixing and allow to sit until it thickens slightly
  • Add mayonnaise. You can use it immediately, but it will get better as it sits. Allow at least an hour for the best flavor.


This should make enough sauce for about four burgers or sandwiches.