Sweet Onion Sauce like Subway Sandwich

One of my readers asked me if I could make the Sweet Onion Sauce that is sold on one of the sandwiches at Subway.

I have to tell you, I have never tasted it before so I did a Google search and found a copycat recipe at Food.com

I tweaked it up because it called for 1 cup of sugar.  YIKES.

My version of Sweet Onion Sauce is so tasty that I don’t care if it tastes like Subway’s or not.

Sweet Onion Sauce Recipe

Sweet Onion Sauce Recipe

Sweet Onion Sauce like Subway Sandwich
Recipe Type: Sauce
Author: Marbaird
Prep time:
Cook time:
Total time:
Serves: 1 cup
  • 2/3 cup granulated sugar
  • 1 cup water
  • 6 tablespoons white vinegar
  • 1 1/2 tablespoons red wine vinegar
  • 1 tablespoon arrowroot
  • 1 tablespoon minced onion flakes
  • 2 1/2 teaspoons Honey Dijon mustard
  • 2 1/2 teaspoons mustard powder
  • 1 teaspoon celery salt
  • 1 teaspoon fresh onion, finely minced (I used a mircoplane)
  • 1 teaspoon poppy seed
  • 1/2 teaspoon salt
  • 1 teaspoon sweet smokey paprika
  • 1/4 teaspoon black pepper
  • 1/8 teaspoon chili sesame oil (hot chili oil)
  1. In a medium-sized sauce pan, whisk all the ingredients listed above.
  2. Place on the stove set to medium-high heat. Whisk continuously until it comes to a boil.
  3. Reduce heat to a simmer for 5 minutes.
  4. Remove from heat.
  5. Let it cool then you can jar it and refrigerate.
2 PP for Two Tablespoons

I served this sweet onion sauce on top of my sirloin burger.  It can be used on just about any sandwich that you usually use mustard and/or mayo.

Sweet Onion Sauce Recipe

It does have a lot of ingredients, but took only minutes to make.

Oh an my new-found ingredient that I love is Arrowroot, which as I mentioned in a previous post is a great thickener.

I sure hope you enjoy your weekend and thanks for stopping by.



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Sweet Onion Sauce like Subway Sandwich — 26 Comments

  1. Hi Marlene, Arrowroot don’t come by easily where I come from. What would be a good substitute for it? Thanks.

    • Cornstarch is a great substitute. Arrowroot is a thickener and if typically found with all the spices. Good Luck I hope you decide to make this sauce because it’s outstanding.

      • Hi Marlene
        I just made this sauce with corn starch as recommended.
        I couldn’t aquire the poppy seeds and red wine vinegar so I replaced them with lightly toasted sesame seeds and apple cider vinegar respectively.

        Followed the rest of the ingredients and instructions to the letter and Oohlala! Delicious Sweet Onion Sauce!

        Indeed I find it tastier than Subway’s.

        This will go well with my next CheeseSteak sandwich project.

        Thanks Marlene! 🙂

        • Loved that you made appropriate substitutes and that it turned out so great. If you have pictures, share them with my on my Nosh My way Facebook page. I would love it.

  2. could this sauce be canned in a jar in a water bath??? I would make a big batch of-it to have on hand. thank you, Lydia

    • Hi Lydia: I never tried jarring it, but I am sure if you follow all the jarring guidelines, you should be fine. Give it a try and let me know how it goes. It’s such a great sauce.

  3. has anyone tried this without the hot chili oil? i really don’t like spice and was wondering if i could substitute for a different oil.

    • Hi Bev: I bet you can add grapeseed oil or just omit the oil completely. The other thought is the chili oil is not that hot but I would hate to have you buy it just to make this recipe. Let me know how it goes if you decide to substitute.

      • Well so far I haven’t gotten around to do this yet but I forgot to ask if it should be done in a pressure canner or water bath. Thanks. Oh one more question is it possible to can everything? Like if I made batches of meals with or with out meat, sauces ect… Like can you can anything and everything???


  4. I would recommend the water bath. Now as to weather anything can be canned, I am totally not prepared to answer that question. But there are lots of website that can help you out with that. Such as Freshpreserving.com

  5. Hey Marlene what’s substitute for celery salt ?? I love onion sauce will make soon !! Do any supermarket sells ?? If in any emergency ??

  6. made this and was surprised, was a tad 2 sweet even with the 2/3 cup sugar,and i didn’t get the onion minced fine enough, couldn’t find the sweet smoky paprika but found smoked paprika and used that, couldn’t find the chili sesame oil so i used just sesame oil, and hey i am super happy with it, smells and tastes just like the one i get from subways, only problem i have with it is i would like it to be thicker, could i use more arrowroot until its to my liking.

  7. Hi! Cant find honey dijonmustard..
    Either honey mustard or dijonmustard.
    Which one should i use?

    • Probably. I haven’t tried it with honey so not sure how much it will modify the original flavor. Try adding 1/2 the amount and then taste it to see if it needs adjustment. Letme know how it turns out. Thanks for stopping by Roda, and happy cooking.