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Subway Copycat Sweet Onion Sauce

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The flavors of sweet and tangy with a hint of onion come together in this recipe for Subway Copycat sweet onion sauce. It’s the perfect condiment to add to your sandwich creation.

This Subway copycat sweet onion sauce begins by adding some sugar and 2 types of vinegar to a sauce pan. You can swap out the sugar for a sugar substitute if you prefer to reduce the calories for this sauce. Now comes the flavor. You add in some dijon mustard, sesame oil and cornstarch. That conrstarch will help thicken the sauce.

Subway Copycat Sweet Onion Sauce | realmomkitchen.com

Next is all the dry ingredients. It’s even more flavor! There is a good list of them but they all help make the wonderful flavor of this sauce. There is dry mustard powder, salt, poppy seeds, celery seed, onion powder, paprika, pepper, and garlic powder. Whisk together and bring it all to a simmer. Simmer for 5 minutes while whisking.

ONce you remove from the heat, allow the sauce to cool completely before adding to an air tight container. You can keep it in the refridgerator for 4 weeks. You can even freeze the sauce to keep it longer.

Subway Copycat Sweet Onion Sauce | realmomkitchen.com
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Subway Copycat Sweet Onion Sauce

  • Author: Laura
  • Total Time: 10 minutes
  • Yield: 1 cup 1x


Units Scale


  1. Add all of the ingredients to a medium sized sauce pan and whisk together.
  2. Bring to a boil over medium heat, whisking often to prevent burning. Then reduce heat to low and simmer until thickened, about 5 minutes. Whisk frequently.
  3. Allow to cool completely, then transfer to an airtight container. Store in the refrigerator and use within 4 weeks, or freeze for longer storage.
  • Prep Time: 5 minutes
  • Cook Time: 5 minutes
  • Category: Sauce
  • Method: Stove Top
  • Cuisine: American
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This recipe is adapted from Dash for Dinner.

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