Subway Sweet Onion Sauce (Copycat) Recipe

Subway Sweet Onion Sauce is a creamy, tangy, slightly sweet sauce served at Subway sandwich shops. It is a popular condiment often used on sandwiches, salads, and as a dipping sauce.

The sauce is made from a blend of onions, vinegar, sugar, and spices, which give it its unique flavor. The exact recipe for Subway Sweet Onion Sauce is a closely guarded secret. Still, it is generally considered a combination of mayonnaise, mustard, onion powder, garlic powder, vinegar, and sugar.

Making Subway’s Sweet Onion Sauce at home has several benefits. Firstly, you can save money by making your version instead of constantly buying it from the store or at Subway.

Secondly, you can customize the recipe to your liking, whether adjusting the sweetness, tanginess, or spice level.

Additionally, making the sauce at home ensures that you know exactly what ingredients are going into it, which can be especially helpful if you have dietary restrictions or food allergies.

Finally, making your sauce can be a fun and creative cooking project that can be shared with friends and family.

Subway Sweet Onion Sauce Nutrition Facts

The nutrition facts for Subway Sweet Onion Sauce can vary slightly depending on the serving size and the specific recipe used. However, a standard 21-gram serving of Subway Sweet Onion Sauce contains approximately:

  • Calories: 40
  • Total Fat: 3.5g
  • Saturated Fat: 0.5g
  • Trans Fat: 0g
  • Cholesterol: 0mg
  • Sodium: 110mg
  • Total Carbohydrates: 2g
  • Dietary Fiber: 0g
  • Sugars: 2g
  • Protein: 0g

It’s worth noting that while Subway Sweet Onion Sauce is low in protein and fiber, it is relatively high in calories and fat compared to other condiments. It’s important to use it in moderation as part of a balanced diet.

How To Make Subway Sweet Onion Sauce

Here’s a recipe for a homemade version of Subway’s Sweet Onion Sauce:

Subway Sweet Onion Sauce

Subway Sweet Onion Sauce

With its smooth consistency and rich aroma, the Subway Sweet Onion sauce complements a variety of ingredients, enhancing the overall taste profile without overpowering the other flavors.
Prep Time 5 minutes
Cook Time 10 minutes
Course Appetizer
Cuisine American
Servings 4 portions
Calories 40 kcal


  • 1/4 cup of white vinegar
  • 3/4 cup of granulated sugar
  • 1/4 cup of red onion finely chopped
  • 1/4 cup of white onion finely chopped
  • 1/2 teaspoon of celery salt
  • 1/2 teaspoon of garlic powder
  • 1/2 teaspoon of paprika
  • 1/2 teaspoon of Worcestershire sauce
  • 1/2 cup of ketchup


  • In a small saucepan, combine the white vinegar and granulated sugar. Cook over medium heat, stirring occasionally, until the sugar dissolves.
  • Add the finely chopped red onion, white onion, celery salt, garlic powder, paprika, and Worcestershire sauce to the saucepan. Stir to combine.
  • Cook the mixture over medium heat, stirring occasionally, for about 10 minutes or until the onions are soft and thickened slightly.
  • Remove the saucepan from the heat and stir in the ketchup until well combined.
  • Allow the Sweet Onion Sauce to cool to room temperature before using it. Store any leftovers in an airtight container in the refrigerator for up to one week.


Enjoy your homemade Sweet Onion Sauce on your favorite Subway sandwiches or as a dipping sauce for your favorite snacks!
Keyword Condiment, Sauce

Tips & Tricks

Here are some tips and tricks for making a homemade Subway-style sweet onion sauce:

  1. Use the right ingredients: To make a good sweet onion sauce, combine sweet onions, red wine vinegar, corn syrup, balsamic vinegar, garlic powder, onion powder, and salt. Make sure you have all the ingredients before you start.
  2. Use a food processor or blender: You must blend all the ingredients to get the right consistency for your sweet onion sauce. You can do this by using a food processor or a blender.
  3. Cook the onions first: To get the most flavor, cook them. Slice the onions and sauté them in a little bit of olive oil until they are caramelized and soft.
  4. Blend in stages: When blending the ingredients, it’s a good idea to blend them in stages. Start by blending the onions with the red wine vinegar and corn syrup, then add the balsamic vinegar, garlic powder, onion powder, and salt.
  5. Adjust the consistency: If the sauce is too thick, add a little water to thin it out. If it’s too thin, add more corn syrup or balsamic vinegar to thicken it up.
  6. Let it sit: Once you’ve made the sweet onion sauce, sit it in the fridge for a few hours before using it. This will allow the flavors to meld together and create a more delicious sauce.
  7. Store it properly: Sweet onion sauce can be stored in an airtight container in the fridge for up to two weeks. Make sure to stir it well before using it again.

Following these tips and tricks, you can make a delicious homemade Subway-style sweet onion sauce perfect for sandwiches, salads, and more!


How To Store?

To store homemade Subway sweet onion sauce, follow these steps:

  1. Let the sauce cool down completely before storing it. If the sauce is still hot, it will condense the container, which can lead to spoilage.
  2. Transfer the sauce to an airtight container. Glass jars or plastic containers with tight-fitting lids work well.
  3. Label the container with the date to know how long it has been stored.
  4. Store the sweet onion sauce in the refrigerator. It will last for up to two weeks if stored properly.
  5. Shake or stir the sauce before using it again, as the ingredients may separate during storage.
  6. Avoid freezing the sweet onion sauce, as the texture may change when thawed.

By following these steps, you can safely store your homemade Subway sweet onion sauce and ensure it stays fresh for as long as possible.

Can you buy sweet onion sauce from Subway?

Yes, Subway does sell its Sweet Onion Sauce as a condiment that customers can purchase to use at home. However, making the sauce at home can be a more cost-effective and convenient option for those who enjoy the flavor of the sauce and want to use it regularly. With the recipe, you can make a larger batch of the sauce and store it in the refrigerator for several days, allowing you to have it on hand whenever needed.

Where can you buy sweet onion sauce like Subway?

You can find it at many grocery stores and online retailers if you prefer to purchase Subway’s Sweet Onion Sauce instead of making it at home. Look for it in your local supermarket’s condiment or sauce section, or check the online stores of major retailers like Walmart, Target, and Amazon. You can also visit Subway’s official website to order the sauce or find a Subway location near you that sells it. Remember that the sauce’s availability may vary depending on your location and the retailer you are purchasing from.

How many calories are in sweet onion sauce from Subway?

According to Subway’s nutritional information, one serving (21 grams) of Sweet Onion Sauce contains 40 calories. Remember that the number of calories may vary depending on the sauce you use on your sandwich or salad. If you are trying to monitor your calorie intake, measuring the sauce you use or asking for it on the side to control the portion size may be helpful.

What toppings does Subway have?

Subway offers a variety of toppings that can be added to its sandwiches and salads. Here are some of the most popular toppings available:

  • Vegetables: lettuce, spinach, tomatoes, onions, peppers, cucumbers, olives, pickles, jalapeños, avocado, and more.
  • Meats: turkey, ham, roast beef, chicken, bacon, pepperoni, salami, and more.
  • Cheeses: American, Swiss, cheddar, provolone, pepper jack, and more.
  • Sauces and dressings: Sweet Onion Sauce, ranch, mustard, mayonnaise, honey mustard, oil and vinegar, Chipotle Southwest, and more.
  • Additional toppings: salt, pepper, oregano, and parmesan cheese.

Subway also offers a variety of bread options, including white, wheat, Italian, and flatbread, as well as wraps and salads. Remember that toppings’ availability may vary depending on the location and menu offerings.

Leave a Comment

Recipe Rating