Homemade Sweet Onion Sauce
Recreate Subway’s famous Homemade Sweet Onion Sauce with this copycat recipe that combines a perfect blend of sweet and tangy flavors. This versatile sauce is ideal for sandwiches, salads, or as a dip, making it suitable for various occasions. With its unique taste and easy preparation, you can elevate any meal effortlessly.
Why You’ll Love This Recipe
- Quick and Easy: This homemade sweet onion sauce takes just 15 minutes to make, allowing you to whip it up anytime you crave that Subway flavor.
- Versatile Use: Perfect as a sandwich sauce, salad dressing, or dipping sauce for veggies and snacks.
- Customizable Flavor: Adjust sweetness or tanginess to suit your personal taste preferences, making it truly your own.
- Vegan-Friendly: Enjoy this delightful sauce without any animal products—great for plant-based diets.
- Cost-Effective: Save money by making your own sauce at home instead of buying store-bought versions.
Tools and Preparation
To make your homemade sweet onion sauce, you’ll need some essential tools and equipment. Having the right tools makes the cooking process smooth and efficient.
Essential Tools and Equipment
- Saucepan
- Whisk
- Airtight container
Importance of Each Tool
- Saucepan: A good-quality saucepan is essential for even heating, ensuring the ingredients mix well and cook properly.
- Whisk: Using a whisk helps to combine ingredients seamlessly, preventing clumps and achieving a smooth texture.
- Airtight container: Storing your homemade sweet onion sauce in an airtight container keeps it fresh longer in the refrigerator.
Ingredients
Recreate Subway’s famous sweet onion sauce with this easy copycat recipe. Perfect blend of sweet and tangy flavors.
For the Sauce
- 1 Cup Sugar
- 1/2 Cup Water
- 6 Tablespoons White Vinegar
- 1 1/2 Tablespoons Red Wine Vinegar
- 1/2 Tablespoon Onion, freshly grated
- 1 Tablespoon Cornstarch
- 2 Teaspoons Dijon Mustard
- 2 Teaspoons Mustard Powder
- 1 Teaspoon Poppy Seeds
- 1/2 Teaspoon Sesame Oil
- 1/2 Teaspoon Onion Powder
- 1/2 Teaspoon Salt
- 1/4 Teaspoon Garlic Powder
- 1/4 Teaspoon Celery Seed
- 1/4 Teaspoon Paprika
- 1/4 Teaspoon Black Pepper
How to Make Homemade Sweet Onion Sauce
Step 1: Combine Ingredients
Add all ingredients to a saucepan.
Step 2: Cook the Mixture
Bring to a boil while whisking constantly. Let boil for 5 minutes, then reduce heat to simmer for another 5 minutes, whisking continuously until thickened.
Step 3: Cool and Store
Remove from heat and allow to cool. Store in an airtight container in the refrigerator for up to 1 week. Enjoy your homemade sweet onion sauce on sandwiches or salads!
How to Serve Homemade Sweet Onion Sauce
Homemade Sweet Onion Sauce is versatile and can elevate many dishes. Here are some delicious ways to enjoy it.
On Sandwiches
- Subway-Style Sandwiches: Drizzle this sauce on your favorite sandwich for that classic Subway taste.
- Wraps: Use it as a spread in wraps filled with fresh veggies, grilled chicken, or turkey.
As a Salad Dressing
- Mixed Greens: Toss it with mixed greens for a refreshing salad dressing.
- Coleslaw: Add to coleslaw for a sweet and tangy twist that pairs perfectly with barbecue.
With Grilled Meats
- Grilled Chicken: Brush it over grilled chicken for added flavor and moisture.
- Pork Chops: Serve alongside pork chops as a unique dipping sauce.
In Dips
- Veggie Platter Dip: Use as a dip for fresh vegetables to add sweetness and depth.
- Chips and Dip: Pair with chips for an easy appetizer at gatherings.

How to Perfect Homemade Sweet Onion Sauce
To enhance your Homemade Sweet Onion Sauce, consider the following tips:
- Adjust Sweetness: If you prefer a sweeter sauce, increase the sugar slightly. Taste as you go!
- Experiment with Vinegars: Try different types of vinegar for varied flavor profiles. Apple cider vinegar can add a fruity note.
- Add Fresh Herbs: Incorporating chopped herbs like dill or parsley can boost freshness and complexity.
- Store Properly: Keep it in an airtight container in the fridge to maintain freshness and flavor for up to a week.
Best Side Dishes for Homemade Sweet Onion Sauce
Homemade Sweet Onion Sauce complements various side dishes beautifully. Here are some tasty options to consider:
- French Fries: Crispy fries dipped in sweet onion sauce create a delightful contrast of flavors.
- Onion Rings: The sweetness of the sauce pairs perfectly with crunchy onion rings.
- Grilled Vegetables: Drizzle over grilled zucchini, bell peppers, or asparagus for added flavor.
- Potato Wedges: Serve with baked potato wedges for an irresistible side dish.
- Garlic Breadsticks: Use as a dipping sauce for warm garlic breadsticks at your next gathering.
- Corn on the Cob: Brush sweet onion sauce on corn on the cob for an unexpected twist during summer barbecues.
Common Mistakes to Avoid
Many home cooks face challenges when making their own sauces. Here are some common mistakes to watch out for when preparing your Homemade Sweet Onion Sauce.
- Ignoring ingredient freshness: Always use fresh ingredients, especially the onion. Freshness enhances flavor and ensures a delicious sauce.
- Not whisking consistently: When boiling the sauce, constant whisking prevents burning and ensures a smooth consistency. Don’t skip this step!
- Overcooking the sauce: If you cook it for too long, the flavors can become too concentrated or burnt. Stick to the recommended time for the best taste.
- Using wrong containers for storage: Store your sauce in airtight glass containers to maintain freshness. Plastic may absorb flavors over time.
- Skipping the cooling step: Allowing the sauce to cool before storage is crucial. It helps preserve its texture and flavor.

Storage & Reheating Instructions
Refrigerator Storage
- Store in an airtight container.
- Keeps well for up to 1 week in the refrigerator.
Freezing Homemade Sweet Onion Sauce
- Freeze in ice cube trays or small containers.
- Can be stored for up to 3 months.
Reheating Homemade Sweet Onion Sauce
- Oven: Preheat to 350°F (175°C), cover with foil, and heat until warm.
- Microwave: Heat in short bursts of 30 seconds, stirring in between to prevent overheating.
- Stovetop: Warm over low heat in a saucepan while stirring until heated through.
Frequently Asked Questions
Here are some common questions about Homemade Sweet Onion Sauce that might help you make this delicious condiment even better!
What is Homemade Sweet Onion Sauce used for?
Homemade Sweet Onion Sauce is perfect as a dressing for salads, a dip for vegetables, or a flavorful addition to sandwiches and wraps.
Can I customize my Homemade Sweet Onion Sauce?
Yes! You can adjust sugar levels or add spices like cayenne pepper for heat. Experiment with flavors that suit your taste!
How do I know if my sweet onion sauce has gone bad?
If you notice any off-smells, changes in color, or mold forming, it’s best to discard it. Always trust your senses!
Is Homemade Sweet Onion Sauce vegan?
Absolutely! All ingredients in this recipe are plant-based, making it a great choice for vegan diets.
How long does it take to make Homemade Sweet Onion Sauce?
From start to finish, this recipe takes about 15 minutes, making it an efficient addition to your meal prep.
Final Thoughts
Making your own Homemade Sweet Onion Sauce at home offers a delightful blend of sweet and tangy flavors that enhance various dishes. Its versatility allows you to customize it according to your preferences. Give this easy copycat recipe a try and elevate your meals with this delightful condiment!

Homemade Sweet Onion Sauce
- Total Time: 15 minutes
- Yield: Approximately 16 servings 1x
Description
Elevate your meals with Homemade Sweet Onion Sauce, a delightful blend of sweet and tangy flavors inspired by Subway’s iconic condiment. This easy copycat recipe takes just 15 minutes to prepare and is incredibly versatile—perfect for drizzling on sandwiches, tossing into salads, or serving as a tasty dip for veggies and snacks.
Ingredients
- 1 Cup Sugar
- 1/2 Cup Water
- 6 Tablespoons White Vinegar
- 1 1/2 Tablespoons Red Wine Vinegar
- 1/2 Tablespoon Freshly Grated Onion
- 1 Tablespoon Cornstarch
- 2 Teaspoons Dijon Mustard
- 2 Teaspoons Mustard Powder
- 1 Teaspoon Poppy Seeds
- 1/2 Teaspoon Sesame Oil
- 1/2 Teaspoon Onion Powder
- 1/2 Teaspoon Salt
- 1/4 Teaspoon Garlic Powder
- 1/4 Teaspoon Celery Seed
- 1/4 Teaspoon Paprika
- 1/4 Teaspoon Black Pepper
Instructions
- In a saucepan, combine all ingredients.
- Bring the mixture to a boil while whisking continuously. Boil for 5 minutes, then reduce heat and simmer for another 5 minutes until thickened.
- Remove from heat and allow to cool before storing in an airtight container in the refrigerator for up to one week.
- Prep Time: 5 minutes
- Cook Time: 10 minutes
- Category: Condiment
- Method: Saucing
- Cuisine: American
Nutrition
- Serving Size: 1 tablespoon (15g)
- Calories: 55
- Sugar: 13g
- Sodium: 22mg
- Fat: 0g
- Saturated Fat: 0g
- Unsaturated Fat: 0g
- Trans Fat: 0g
- Carbohydrates: 14g
- Fiber: 0g
- Protein: <1g
- Cholesterol: 0mg