Do you ever find yourself craving that tangy, sweet, and slightly savory flavor of Subway’s iconic Sweet Onion Sauce? Whether you’re drizzling it over a sub, using it as a dip, or adding it to a salad, this sauce has a way of elevating any meal. For years, I’ve been obsessed with recreating this sauce at home, and after countless trials, I’ve finally cracked the code. In this article, I’ll share my foolproof sweet onion sauce subway recipe that tastes just like the real deal. Let’s dive in!
Why You’ll Love This Sweet Onion Sauce Subway Recipe
If you’re a fan of Subway’s Sweet Onion Sauce, you’re going to adore this homemade version. Here’s why:
- Tastes just like Subway’s sauce: This recipe captures the perfect balance of sweetness, tanginess, and creaminess that makes the original so irresistible.
- Quick and easy: With just a handful of ingredients and 10 minutes of prep time, you can whip up this sauce in no time.
- Versatile: Use it as a dressing, dip, or marinade to add a burst of flavor to your meals.
- Cost-effective: Why spend extra money on store-bought versions when you can make it at home for a fraction of the cost?

Ingredients for the Perfect Sweet Onion Sauce Subway Recipe
Before you start, gather all the ingredients you’ll need. Here’s a detailed list to ensure you’re fully prepared:
Sweet Onion Sauce Recipe Subway Ingredients
Ingredient | Quantity |
---|---|
Sweet onion (finely chopped) | 1 medium |
White vinegar | 1/4 cup |
Olive oil | 2 tbsp |
Honey | 2 tbsp |
Dijon mustard | 1 tbsp |
Mayonnaise | 1/2 cup |
Salt | 1/2 tsp |
Black pepper | 1/4 tsp |
Poppy seeds (optional) | 1 tsp |
Step-by-Step Guide to Making Subway Sweet Onion Sauce Recipe
Now that you have all your ingredients ready, let’s walk through the process of making this delicious sauce. This step-by-step guide ensures you’ll achieve the perfect balance of sweet, tangy, and creamy flavors that make Subway’s sauce so irresistible. Whether you’re a beginner or a seasoned cook, this recipe is straightforward and foolproof. Follow along, and you’ll have a homemade version that rivals the original in no time!
How to Make Subway Sweet Onion Sauce Recipe
- Prepare the Onion: Start by finely chopping the sweet onion. The finer the chop, the smoother your sauce will be. If you prefer a chunkier texture, you can leave the pieces slightly larger.
- Mix Wet Ingredients: In a medium-sized bowl, combine the white vinegar, olive oil, honey, and Dijon mustard. Whisk these ingredients together until they’re well blended. This mixture forms the base of your sauce and provides the perfect balance of tanginess and sweetness.
- Add Mayonnaise: Stir in the mayonnaise to create a creamy base. Make sure to mix thoroughly to avoid any lumps.
- Season: Add the salt, black pepper, and poppy seeds (if using). The poppy seeds add a subtle crunch and visual appeal, but they’re entirely optional.
- Combine Everything: Mix in the chopped sweet onion and stir until everything is fully incorporated.
- Chill: Let the sauce sit in the refrigerator for at least 30 minutes. This allows the flavors to meld together, giving you a sauce that’s rich and flavorful.
Tips for Perfecting Your Sweet Onion Sauce Recipe
To ensure your sauce turns out perfectly every time, keep these tips in mind:
- Use fresh ingredients: Fresh sweet onions and high-quality mayonnaise make a significant difference in the final flavor.
- Adjust sweetness: If you prefer a sweeter sauce, add an extra tablespoon of honey.
- Blend for smoothness: For a smoother consistency, blend the sauce in a food processor or blender.
- Storage: Store your sauce in an airtight container in the fridge. It will stay fresh for up to a week.
Creative Ways to Use Your Sweet Onion Sauce
This versatile sauce can be used in a variety of ways to enhance your meals. Here are some ideas to get you started:
- Sandwiches and Wraps: Recreate your favorite Subway sandwiches at home. Drizzle the sauce over a sub filled with turkey, ham, or veggies for an authentic experience.
- Salad Dressing: Use it as a dressing for a fresh garden salad. It pairs particularly well with greens, cherry tomatoes, and cucumbers.
- Dip: Serve it as a dip for chicken tenders, fries, or fresh veggies.
- Marinade: Use it to marinate grilled chicken or tofu before cooking. The flavors will infuse beautifully, giving your protein a delicious twist.

FAQs About Sweet Onion Sauce Subway Recipe
Can I make a vegan version of the sweet onion sauce recipe?
Absolutely! Simply replace the mayonnaise with a vegan alternative. There are many plant-based mayo options available that work just as well.
How long does the subway sweet onion sauce recipe last?
When stored properly in an airtight container in the fridge, the sauce can last up to 7 days.
Can I use a different type of onion?
While sweet onions are recommended for their mild flavor, you can use yellow onions as a substitute. Keep in mind that yellow onions have a stronger flavor, so you may want to use a bit less.
Is this recipe gluten-free?
Yes, this sweet onion sauce subway recipe is naturally gluten-free. Just make sure to check the labels on your ingredients to ensure they haven’t been processed in a facility that handles gluten.
Conclusion: Enjoy Your Homemade Sweet Onion Sauce
There you have it—a simple, delicious, and authentic sweet onion sauce subway recipe that you can make in the comfort of your own kitchen. Whether you’re a Subway fan or just love experimenting with new sauces, this recipe is sure to become a staple in your home.
So, what are you waiting for? Gather your ingredients and give this recipe a try. Once you taste the results, you’ll never go back to store-bought versions. Don’t forget to share your creations with friends and family—they’ll be begging you for the recipe!