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Home » Uncategorized » Subway Sweet Onion Sauce Recipe

Subway Sweet Onion Sauce Recipe

June 10, 2021 by Geetanjali 14 Comments

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Easy Subway sweet onion sauce recipe made from scratch within 15 minutes. If you love sweet onion sauce at Subway, this recipe is for you!

Subway copycat sweet onion sauce recipe
Subway Sweet Onion Sauce

The recipe I am sharing is very close to what you would get at the Subway restaurants. It has the perfect balance of sweet and tangy flavors. I always make this condiment to pair my Subway style dinner – especially with chicken teriyaki sandwiches.

This easy, inexpensive, homemade Subway’s sweet onion sauce recipe is so useful when you are at home and want to enjoy a copycat subway experience.

This sweet onion sauce is 

  • vegan
  • gluten-free
  • preservative-free
  • oil-free
  • & kid-friendly

What to eat with Sweet Onion Sauce

There are various ways it can be served. 

  • Spread: Use It as a spread on bread or your favorite sandwiches. 
  • Salad dressing: Drizzle on salad to give it a flavor boost
  • Dipping sauce: Excellent dipping sauce for roasted, grilled, or fried veggies, fish, or chicken. 
  • Marinade: Use as a marinade for meat, chicken, fish.

I also love using mine with chips, french fries, baked potato, paratha, and pita bread. Here are some of the great recipes that work with sweet onion sauce.

  • Paneer Pakora
  • Aloo Bonda
  • Grilled Potato wedges
  • Mirchi Vada
  • Paneer Potato Balls
  • Chicken Fry
  • Gobi Pakora
  • Watermelon Mango Salad

Is this Sweet Onion Sauce Healthy?

It is a far better alternative than store-bought sauces in terms of fat and sodium content. But it contains sugar. So, eating moderately is usually fine.

Sweet Onion Sauce Ingredients

The ingredients used in this sauce are simple and fresh. Once you have got all the ingredients ready it just takes minutes to come together. Here’s all you need:

Ingredients used in sweet onion sauce
Sweet Onion Sauce Ingredients
  • Onion: any sweet variety; Some popular sweet onion varieties include Walla walla, Texas sweets, Maui, and Vidalia. White or yellow onion will work as well.
  • Garlic: just a touch, to enhance the flavor;
  • Vinegar: plain white distilled vinegar and balsamic vinegar;
  • Granulated Sugar: you can also use brown sugar;
  • Cornflour: cornflour or cornstarch to thicken the sauce;
  • Black pepper powder: freshly ground is best;
  • Nigella seed(also called kalonji): available in Asian grocery stores. Tastes like oregano and onion mix. It adds a hint of extra flavor. I like the flavor but you can totally choose to skip it; 
  • Lemon juice: fresh;
  • Salt: regular table salt;
  • Water: cold filtered water;

Preparations Step By Step

  • Peel the onion and garlic, roughly chop them, and blend until look smooth. Squeeze the juice using a muslin cloth and transfer to a pan or pot.
  • Heat up the pan. Add in water along with sugar, salt, white vinegar, balsamic vinegar, black pepper, nigella seeds, and bring the mixture to a boil until sugar dissolves. 
Sweet onion sauce making step by step
Sweet Onion Sauce Stepwise
  • Whisk ¼ cup water and cornflour together in a bowl, and make a slurry.
  • Add in cornflour slurry and stir continuously over medium flame until the sauce thickens and looks glossier.
  • Remove from heat and add lemon juice. Stir to mix and allow the sauce to come to room temperature. 
  • Store in an airtight container in the refrigerator and use when needed.
Subway copycat sweet onion sauce recipe
Sweet Onion Sauce

How to store

Let it cool, then transfer to an airtight container and refrigerate for up to 5 days. 

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Subway Sweet Onion Sauce
Print Recipe
5 from 13 votes

Subway Sweet Onion Sauce Recipe

Subway copycat sweet onion sauce recipe at home from scratch within 15 minutes. An easy, vegan, gluten-free, oil-free, recipe.
Prep Time5 mins
Cook Time10 mins
Total Time15 mins
Course Condiment, Sides
Cuisine Global
Keyword Subway sweet onion sauce recipe, Sweet onion sauce
Servings1 cup
Author Geetanjali

INGREDIENTS ( 1 CUP = 240 ML )

  • 1 medium-size onion
  • 2 garlic cloves
  • ¾ cup water plus ¼ cup water
  • ⅓ cup granulated sugar
  • 1 tsp balsamic vinegar
  • 1 tsp white vinegar
  • ¼ tsp nigella seeds/kalonji
  • ¼ tsp black pepper, freshly ground or to taste
  • ¼ tsp salt or to taste
  • 2 tsp cornflour
  • ½ tsp lemon juice, fresh

INSTRUCTIONS

  • Peel the onion and garlic, roughly chop them, and blend until look smooth. Squeeze the juice using a muslin cloth and transfer to a pan or pot.
  • Heat up the pan. Add in water along with sugar, salt, white vinegar, balsamic vinegar, black pepper, and nigella seeds. Bring the mixture to a boil until sugar dissolves.
  • Whisk ¼ cup water and cornflour together in a bowl, and make a slurry.
  • Add in cornflour slurry and stir continuously over medium flame until the sauce thickens and looks glossier.
  • Remove from heat and add lemon juice. Stir to mix and allow the sauce to come to room temperature.
  • Store in an airtight container in the refrigerator and use when needed.

Notes

Ingredient notes: 
  • Onion: any sweet variety; Some popular sweet onion varieties include Walla walla, Texas sweets, Maui, and Vidalia. White or yellow onion will work as well.
  • Garlic: just a touch, to enhance the flavor;
  • Vinegar: plain white distilled vinegar and balsamic vinegar;
  • Granulated Sugar: you can also use brown sugar;
  • Cornflour: cornflour or cornstarch to thicken the sauce;
  • Black pepper powder: freshly ground is best;
  • Nigella seed(also called kalonji): available in Asian grocery stores. Tastes like oregano and onion mix. It adds a hint of extra flavor. I like the flavor but you can totally choose to skip it; 
  • Lemon juice: fresh;
  • Salt: regular table salt;
  • Water: cold filtered water;

Filed Under: Uncategorized

Previous Post: « Simple Hibachi Fried Rice Recipe | Japanese Fried Rice
Next Post: Lauki Ki Sabzi | Bottle Gourd Curry »

Reader Interactions

Comments

  1. Sudhir sarkar

    June 13, 2021 at 12:10 pm

    Excellent

    Reply
    • Geetanjali

      June 23, 2021 at 11:50 am

      Thank you!

      Reply
  2. Anaiah

    June 25, 2021 at 1:11 pm

    This sweet onion sauce was so flavorful and quick to make!

    Reply
  3. Alexandra

    June 25, 2021 at 1:33 pm

    What a delicious sauce – full of flavour.

    Reply
  4. Kylie

    June 25, 2021 at 2:27 pm

    Yum! We really enjoyed this!

    Reply
  5. Ramona

    June 25, 2021 at 3:40 pm

    This was good!! Will definitely make it again!

    Reply
  6. Alice | SkinnySpatula

    June 25, 2021 at 3:41 pm

    Looks smashing! I love that sauce at Subway and yours looks just like it.

    Reply
  7. Kristina

    June 25, 2021 at 5:46 pm

    A great alternative to the real thing, only I suspect this one has way more “fresh” and “natural” ingredients. Thanks for sharing this!

    Reply
  8. Pam

    June 25, 2021 at 6:47 pm

    I use this on everything!

    Reply
  9. Kayla DiMaggio

    June 25, 2021 at 7:12 pm

    This was so good that I bookmarked it! I love Subway’s sweet onion sauce and I get it everytime. Now I know how to make it from home!

    Reply
  10. Sue

    June 25, 2021 at 7:18 pm

    My favorite sauce from Subway!

    Reply
  11. Oscar

    June 26, 2021 at 4:38 am

    Great recipe

    Reply
  12. Ksenia

    June 26, 2021 at 6:44 am

    Finally, one of my favourite sauce is revealed!

    Reply
  13. Mihaela|https://theworldisanoyster.com/

    June 26, 2021 at 2:59 pm

    I had no idea it was so easy to make!

    Reply

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