Homemade Sweet Onion Sauce
Recreate Subway’s famous Homemade Sweet Onion Sauce with this easy copycat recipe. This delightful sauce offers a perfect blend of sweet and tangy flavors that complements sandwiches, salads, and wraps beautifully. Whether you’re hosting a gathering or simply looking to enhance your meals at home, this sauce is versatile and sure to impress. Plus, it’s quick to make, taking only 15 minutes from start to finish!
Why You’ll Love This Recipe
- Easy to Make: With simple ingredients and quick prep time, you’ll whip up this sauce in no time.
- Versatile Flavor: Perfect for sandwiches, salads, and even as a marinade for grilled dishes.
- Fresh Ingredients: Using fresh onions and common pantry items ensures a delicious homemade taste.
- Customizable: Adjust the sweetness or tanginess to match your personal preference.
- Healthy Option: This vegan-friendly sauce allows you to enjoy great flavor without any preservatives.
Tools and Preparation
Having the right tools makes cooking much easier. For this recipe, you’ll want to ensure you have everything ready before you start.
Essential Tools and Equipment
- Saucepan
- Whisk
- Measuring cups
- Measuring spoons
- Airtight container
Importance of Each Tool
- Saucepan: A good saucepan is essential for evenly heating your sauce while combining ingredients effectively.
- Whisk: This tool helps prevent lumps by mixing the ingredients thoroughly while boiling.
- Airtight container: Storing your homemade sweet onion sauce in an airtight container keeps it fresh for up to a week.
Ingredients
To make your Homemade Sweet Onion Sauce, gather the following ingredients:
Base Ingredients
- 1 Cup Sugar
- 1/2 Cup Water
- 6 Tablespoons White Vinegar
- 1 1/2 Tablespoons Red Wine Vinegar
Flavor Enhancers
- 1/2 Tablespoon Onion, freshly grated
- 1 Tablespoon Cornstarch
- 2 Teaspoons Dijon Mustard
- 2 Teaspoons Mustard Powder
Seasoning
- 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: Heat the Mixture
Bring the mixture to a boil while whisking constantly. Let it boil for 5 minutes.
Step 3: Simmer the Sauce
Reduce heat to simmer for another 5 minutes while continuing to whisk.
Step 4: Cool Down
Remove from heat and allow the sauce to cool.
Step 5: Store Properly
Store in an airtight container in the refrigerator for up to one week. Enjoy your homemade sweet onion sauce on various dishes!
How to Serve Homemade Sweet Onion Sauce
Homemade Sweet Onion Sauce is versatile and can elevate many dishes. Whether you’re adding it to a sandwich or using it as a dip, this sauce brings a delightful sweet and tangy flavor to your meals.
On Sandwiches
- Add to your favorite sandwiches for an extra layer of flavor. Its sweetness pairs well with deli meats and fresh veggies.
As a Salad Dressing
- Drizzle over salads to enhance the taste. The tangy notes complement fresh greens beautifully.
With Grilled Meats
- Use as a glaze for grilled chicken or pork. It adds moisture and sweetness, making the meat even more delicious.
In Wraps
- Spread on wraps for a tasty twist. It works great with both veggie and protein-packed fillings.
As a Dip
- Serve alongside veggie platters or chips. This sauce is perfect for dipping, offering a unique flavor experience.
On Tacos
- Use as a topping for tacos. The sweetness balances out spicy flavors, creating harmony in each bite.

How to Perfect Homemade Sweet Onion Sauce
To achieve the best version of Homemade Sweet Onion Sauce, consider these helpful tips to enhance your cooking experience.
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Fresh Ingredients: Always use freshly grated onion for the best flavor. It ensures maximum sweetness and aroma.
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Adjust Sweetness: Feel free to tweak the sugar amount based on your preference. A little less sugar can make it less sweet if desired.
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Whisk Constantly: While cooking, whisk continuously to prevent sticking or burning. This helps in achieving a smooth consistency.
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Chill Before Serving: Allow the sauce to cool completely before serving. Chilling enhances the flavors and creates a thicker texture.
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Store Properly: Keep the sauce in an airtight container in the fridge. This will help maintain its freshness for up to one week.
Best Side Dishes for Homemade Sweet Onion Sauce
Homemade Sweet Onion Sauce complements various side dishes that can enhance your meal experience. Here are some excellent options:
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Grilled Vegetables: Toss seasonal veggies on the grill and serve with this sauce drizzled on top for added flavor.
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Potato Wedges: Bake or fry potato wedges until crispy, then dip them into the sweet onion sauce for a delectable snack.
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Coleslaw: Mix coleslaw with homemade sweet onion sauce instead of traditional dressings for a refreshing twist on this classic dish.
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Corn on the Cob: Brush cooked corn with sweet onion sauce while it’s still hot for an irresistible side that’s sure to impress.
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Stuffed Peppers: Use sweet onion sauce as part of the filling or drizzle over stuffed peppers before baking them in the oven.
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Rice Pilaf: Add a spoonful of this sauce to rice pilaf for an unexpected burst of flavor that will elevate your grains.
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Crispy Chicken Tenders: Pair crispy chicken tenders with homemade sweet onion sauce as an alternative dipping option that adds excitement to your meal.
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Pasta Salad: Stir some sweet onion sauce into a cold pasta salad to create an exciting blend of flavors that everyone will enjoy.
Common Mistakes to Avoid
Making Homemade Sweet Onion Sauce can be simple, but there are common mistakes that may affect the final product. Here are some pitfalls to watch out for:
- Using stale ingredients: Always check the freshness of your ingredients, especially spices and vinegars, as they can lose flavor over time.
- Skipping the whisking: Whisk continuously while boiling; this prevents lumps from forming and ensures a smooth consistency.
- Not adjusting seasoning: Taste your sauce before cooling it down. Adjust salt or sweetness based on your preference for a balanced flavor.
- Incorrect storage: Store your sauce in an airtight container in the refrigerator to maintain its freshness for up to a week.
- Overheating during reheating: When reheating, do so gently to avoid altering the sauce’s texture and flavor.

Storage & Reheating Instructions
Refrigerator Storage
- Store in an airtight container.
- Keep in the refrigerator for up to 1 week.
Freezing Homemade Sweet Onion Sauce
- Freeze in ice cube trays for easy portioning.
- Transfer frozen cubes to a freezer-safe bag and use within 3 months.
Reheating Homemade Sweet Onion Sauce
- Oven: Preheat to 350°F (175°C) and heat sauce in a covered dish until warm.
- Microwave: Heat in short intervals, stirring between, until warmed through.
- Stovetop: Gently heat on low, stirring frequently to prevent sticking.
Frequently Asked Questions
Here are some common questions about making Homemade Sweet Onion Sauce, along with their answers.
Can I adjust the sweetness of my Homemade Sweet Onion Sauce?
Yes! You can add more or less sugar according to your taste preference. Just remember that a little goes a long way.
What dishes pair well with Homemade Sweet Onion Sauce?
This sauce is great on sandwiches, salads, or as a dip for vegetables. Its sweet-tangy flavor enhances many meals!
Is Homemade Sweet Onion Sauce vegan-friendly?
Absolutely! All the ingredients used are plant-based, making this sauce suitable for vegans.
How long does Homemade Sweet Onion Sauce last?
When stored properly in the refrigerator, it lasts up to 1 week. For longer storage, consider freezing it.
Final Thoughts
This Homemade Sweet Onion Sauce offers a delightful blend of sweet and tangy flavors that will elevate your meals. With its versatility, you can customize it by adjusting the sweetness or adding different spices. Give this easy recipe a try and enjoy a delicious addition to your dishes!

Homemade Sweet Onion Sauce
- Total Time: 15 minutes
- Yield: About 10 servings 1x
Description
Recreate Subway’s beloved Homemade Sweet Onion Sauce at home with this simple and quick copycat recipe. This delightful sauce combines a perfect balance of sweet and tangy flavors, making it an excellent addition to sandwiches, salads, and wraps. In just 15 minutes, you can whip up this versatile condiment that will impress your guests and elevate your everyday meals. With fresh ingredients and customizability, you can tailor the sauce to suit your taste preferences while enjoying a healthy, vegan-friendly option free from preservatives.
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
- Combine all ingredients in a saucepan.
- Bring the mixture to a boil while whisking constantly for about 5 minutes.
- Reduce heat and simmer for another 5 minutes, still whisking.
- Remove from heat and let cool.
- Store in an airtight container in the refrigerator for up to one week.
- Prep Time: 5 minutes
- Cook Time: 10 minutes
- Category: Sauce
- Method: Cooking
- Cuisine: American
Nutrition
- Serving Size: 2 tablespoons (30g)
- Calories: 70
- Sugar: 16g
- Sodium: 30mg
- Fat: 0g
- Saturated Fat: 0g
- Unsaturated Fat: 0g
- Trans Fat: 0g
- Carbohydrates: 17g
- Fiber: 0g
- Protein: <1g
- Cholesterol: 0mg