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Jack in the Box secret sauce

Jack in the Box secret sauce

This is the sauce formerly used on the Bonus Jack and the Jumbo Jack before 1999. It's still available in packets at some locations.


  • 2 tbsp mayonnaise
  • 1 tbsp ketchup
  • 2 tsp yellow mustard
  • 1 tsp white vinegar
  • 1 tsp dehydrated onion or 1/2 tsp onion powder
  • 1 large drop A1 Steak Sauce
  • 2 drops Worcestershire Sauce
  • 1 drop Tabasco or Sriracha, or other hot sauce optional
  • 1/4 tsp Xanthan gum optional


  • Combine vinegar and onion and allow for spices to rehydrate for 30 minutes.
  • Combine all remaining ingredients with vinegar mixture except xanthan gum (if using).
  • Slowly sprinkle xanthan into mixture while stirring constantly to avoid lumps
  • Allow to sit in the refrigerator for 30 minutes for the flavors to develop


The xanthan gum is optional and is there to thicken the mixture and provide a familiar fast food texture. It doesn't add any flavor so is fine without it.