Subway Sweet Onion Sauce recipe is a copycat recipe that is designed to taste just like the real thing. If you liked our McDonalds Sweet and Sour Sauce copycat recipe then you will love this recipe for Sweet Onion Sauce. Follow our simple instructions to learn how to make this Subway signature sauce right at home. This recipe is kosher, pareve, and has a gluten free variant.
Why This Recipe Works
- Easy to make. This sauce recipe involves mixing the right ingredients together to make a delicious sauce. Minimal cooking which means that it is a snap to put together.
- Ready in less than 10 minutes. Copycat Subway Sweet Onion Sauce takes as long to make as it does to measure out the ingredients and stir. (Less than 10 minutes).
- Easy to store. If you don't have a condiment bottle, I highly recommend picking up a few for sauces like this. Amazon sells these bottles and they make great storage and dispensing vessels for sauces and dressings. This sauce can also be stored in an airtight plastic container. Either option allows the Sweet Onion Sauce to be stored for up to 30 days.
- Soooo tasty. Years ago when I used to frequent Subway I would get this sauce on everything.
- Granulated sugar - this is a sweet sauce and the sweetness comes from granulate sugar.
- White vinegar - for acidity.
- Soy sauce - gives the Sweet Onion Sauce some body and saltiness.
- Corn starch - thickens the sauce.
- Rice vinegar - adds more acidity but has a lighter and less biting flavor than the white vinegar or red wine vinegar.
- Grated onion - for added sweetness and the little bits of onion add to the flavor of the sauce. This is where the onion flavor of the sauce comes from.
- Tomato paste - to make the flavor a little richer.
- Mustard powder - adds just a little bit of bite to the sauce. If you don't have mustard powder you can substitute Dijon mustard.
- Garlic powder - adds to the depth of flavor.
- Toasted sesame oil - adds to the richness of the flavor profile. Make sure that you use toasted sesame oil and not regular sesame oil...there is a huge difference and the Subway Copycat Sweet Onion Sauce will not taste right with the wrong oil.
- Poppyseeds - adds to the body and texture of the sauce.
- Black pepper - rounds out the flavor profile.
How to Make Subway Copycat Sweet Onion Sauce Step by Step:
Put all of the ingredients into a pot and bring to a boil while stirring. Keep stirring until the sugar is completely dissolved into the water. This should take about 2-3 minutes. Cool for 1-2 hours before serving. So simple!
- Sweet Onion Chicken Sandwich. Subway originally launched its Sweet Onion Sauce as part of a chicken sandwich. Who are we to argue with perfection. Shred a cooked chicken breast, and mix in enough sauce for your tastes. Scoop the teriyaki chicken onto a kaiser roll, top with our Quick Asian Slaw, and enjoy!
- Sweet Onion Baked Salami. Use this Sweet Sweet Onion Sauce as a substitute in our Sweet and Tangy Baked Salami recipe.
- Dipping sauce for egg rolls. Egg rolls and yummy sauces are some of our favorite combinations. Use Copycat Subway Sweet Onion Sauce as a dipping sauce for our Pastrami Egg Rolls.
- Sweet Onion Whole Roast Chicken. Our Easy Whole Roast Chicken recipe is great with this sauce. Brush some of the Sweet Onion Sauce over the skin during the last 30 minutes of baking. Keep some extra sauce on the side to serve along with the chicken.
- Gluten free Subway Copycat Sweet Onion Sauce. Instead of soy sauce, substitute these coconut aminos.
- Sweet Onion Teriyaki Salmon. Use this sauce in place of the Apricot Glaze in our Glazed Salmon Recipe.
- Subway Sweet Onion Sauce (Copycat) Without Cornstarch. Substitute in tapioca starch or potato starch in for corn starch.
- Salad Dressing. Sweet Onion Sauce becomes Sweet Onion Dressing very easily. Try substituting this recipe for the dressing in our Easy Cobb Salad Recipe.
Subway Sweet Onion Sauce (Copycat)
- 1 cup Sugar
- ⅔ cup Water
- ⅓ cup White vinegar
- 1 tablespoon Corn starch
- 2 teaspoon grated onion
- 1 teaspoon Soy Sauce
- 1 tablespoon Rice vinegar
- 1 teaspoon Salt
- ¼ teaspoon Dehydrated onion
- ½ teaspoon Tomato paste
- 2 teaspoon Mustard powder
- ¼ teaspoon Garlic powder
- ½ teaspoon Sesame Oil
- ½ teaspoon Poppyseeds
- ¼ teaspoon Ground black pepper
- Place all ingredients into a pot and bring to a boil stirring constantly.
- Once sugar is dissolved, turn off the heat and cool for 1-2 hours.