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Home » Recipe Index » Homemade Sweet Onion Sauce

Homemade Sweet Onion Sauce

May 21, 2025 by Debra

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Recreate Subway’s famous sweet onion sauce with this easy Homemade Sweet Onion Sauce recipe. This delicious blend of sweet and tangy flavors enhances sandwiches, salads, and more. Perfect for gatherings, picnics, or simply elevating your everyday meals, this sauce is a must-have in your kitchen arsenal.

Homemade Sweet Onion SauceSAVE THIS!

Why You’ll Love This Recipe

  • Easy to Make: With just a few simple ingredients, you can whip up this flavorful sauce in no time.
  • Versatile Use: Perfect as a sandwich spread, dip, or marinade; it adds a delightful twist to any dish.
  • Fresh Ingredients: Using fresh ingredients ensures that you know exactly what’s in your food.
  • Quick Prep and Cook Time: Ready in just 15 minutes, making it an ideal choice for busy days.
  • Refrigerator Friendly: Store it for up to a week; enjoy it whenever the craving strikes!

Tools and Preparation

To achieve the best results when making your Homemade Sweet Onion Sauce, having the right tools is essential. Here are some key items you’ll need.

Essential Tools and Equipment

  • Saucepan
  • Whisk
  • Measuring cups
  • Measuring spoons
  • Airtight container

Importance of Each Tool

  • Saucepan: A sturdy saucepan helps distribute heat evenly for consistent cooking.
  • Whisk: Essential for mixing ingredients thoroughly and preventing clumps while heating.
  • Airtight container: Keeps your sauce fresh in the fridge for longer storage.

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

For Garnish

  • 2 tablespoons fresh parsley, finely chopped

How to Make Homemade Sweet Onion Sauce

Step 1: Combine Ingredients

Add all ingredients to a saucepan.

Step 2: Heat the Mixture

Bring to a boil while whisking constantly. Let it boil for 5 minutes.

Step 3: Simmer the Sauce

Reduce heat and simmer for another 5 minutes, whisking continuously until thickened.

Step 4: Cool Down and Store

Remove from heat and allow to cool completely. Store in an airtight container in the refrigerator for up to 1 week.

Now you’re ready to enjoy your homemade sweet onion sauce! Use it on your favorite dishes or share it with friends at your next gathering.

How to Serve Homemade Sweet Onion Sauce

Homemade Sweet Onion Sauce is versatile and can enhance a variety of dishes. Whether you’re dressing up a sandwich or adding flavor to a salad, this sauce will bring a delightful sweet and tangy taste.

Sandwiches

  • Use on your favorite sub or sandwich for that classic Subway taste.
  • Drizzle over grilled chicken sandwiches for extra flavor.

Salads

  • Toss with mixed greens for a refreshing salad dressing.
  • Pair with coleslaw for a sweet twist.

Dipping Sauce

  • Serve as a dip for fresh veggies or pretzels.
  • Great with chicken nuggets or tenders for added zest.

Marinade

  • Use as a marinade for grilled vegetables or meats.
  • Perfect for tofu if you’re looking for a vegan option.

Pasta Salad

  • Mix into pasta salads for an unexpected flavor boost.
  • Combine with cherry tomatoes and cucumbers for a light dish.
HomemadeSAVE THIS!

How to Perfect Homemade Sweet Onion Sauce

To ensure your recipe comes out perfectly every time, follow these simple tips.

  • Use fresh ingredients: Fresh onion and quality vinegars enhance the sauce’s flavor.
  • Whisk constantly: This helps to prevent clumping when cooking the sauce.
  • Adjust sweetness: Feel free to tweak the sugar amount based on your personal taste preferences.
  • Store properly: Keep the sauce in an airtight container to maintain freshness in the fridge.
  • Experiment with spices: Add more mustard or other spices to customize the flavor profile.

Best Side Dishes for Homemade Sweet Onion Sauce

Homemade Sweet Onion Sauce pairs beautifully with many side dishes. Here are some delicious options to serve alongside it.

  1. French Fries: Crispy fries are perfect for dipping into this sweet sauce.
  2. Grilled Vegetables: Tossed with a little olive oil and grilled, they make an excellent complement.
  3. Potato Wedges: Seasoned wedges bring out the flavors of the sauce beautifully.
  4. Onion Rings: Crunchy onion rings create a perfect pairing with this onion-based sauce.
  5. Coleslaw: A creamy slaw can balance out the sweetness of the onion sauce nicely.
  6. Corn on the Cob: Slathered in homemade sweet onion sauce, corn becomes even more irresistible.

Common Mistakes to Avoid

Making the recipe can be simple, but there are common pitfalls. Here are mistakes to watch out for:

  • Skipping fresh ingredients: Always use freshly grated onion for the best flavor. Store-bought onion powders lack the vibrant taste needed.
  • Ignoring cooking times: Don’t rush the boiling and simmering process. These steps are crucial for achieving the perfect consistency and flavor.
  • Neglecting storage advice: If you don’t store the sauce properly, it may spoil quickly. Use airtight containers and keep it in the refrigerator.
  • Overusing vinegar: Balance is key! Too much vinegar can overpower the sweetness. Measure carefully to ensure a harmonious blend of flavors.
  • Not adjusting seasonings: Customize your sauce based on your taste preference. Feel free to add more spices or adjust sweetness as desired.

Storage & Reheating Instructions

Refrigerator Storage

  • Store in an airtight container for up to 1 week.
  • Label your container with the date to track freshness easily.

Freezing Homemade Sweet Onion Sauce

  • Pour into freezer-safe containers, leaving some space at the top for expansion.
  • It can be frozen for up to 3 months without losing flavor.

Reheating Homemade Sweet Onion Sauce

  • Oven: Preheat oven to 350°F (175°C) and warm sauce in a covered dish until heated through.
  • Microwave: Heat in short intervals (30 seconds), stirring in between until hot.
  • Stovetop: Warm over low heat, stirring frequently to avoid burning.

Frequently Asked Questions

Here are some common questions that might help you understand it better.

How long does homemade sweet onion sauce last?

It lasts up to 1 week in the refrigerator when stored properly in an airtight container.

Can I make homemade sweet onion sauce vegan?

Yes! This recipe is inherently vegan, using plant-based ingredients like sugar and vinegars without any animal products.

What dishes pair well with homemade sweet onion sauce?

This versatile sauce complements sandwiches, salads, and grilled vegetables beautifully, adding a sweet and tangy kick.

Can I substitute ingredients in homemade sweet onion sauce?

Absolutely! Feel free to swap out vinegars or adjust spices based on your personal taste preferences.

Is homemade sweet onion sauce gluten-free?

Yes! All ingredients used in this recipe are gluten-free, making it suitable for those with gluten sensitivities.

Final Thoughts

This recipe is not only easy to prepare but also incredibly versatile. Its unique blend of sweet and tangy flavors elevates any dish. Experiment with the spices or add your favorite herbs for a personal touch. Don’t hesitate—try making it today!

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Homemade Sweet Onion Sauce

Homemade Sweet Onion Sauce


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  • Author: Debra
  • Total Time: 15 minutes
  • Yield: About 12 servings 1x
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Description

Create your own version of Subway’s iconic sweet onion sauce with this delightful Homemade Sweet Onion Sauce recipe. This easy-to-make sauce features a perfect balance of sweet and tangy flavors, making it an ideal condiment for sandwiches and salads alike. In just 15 minutes, you can elevate your meals with this versatile sauce—perfect for picnics, gatherings, or simply enhancing your everyday dishes. Best of all, it’s made with fresh ingredients, allowing you to control the flavor and quality. Whether you’re using it as a dip or a marinade, this homemade sauce is sure to impress.


Ingredients

Scale
  • 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

Instructions

  1. In a saucepan, combine all ingredients.
  2. Bring the mixture to a boil while whisking constantly for about 5 minutes.
  3. Reduce heat and simmer for an additional 5 minutes, whisking continuously until thickened.
  4. Remove from heat and let cool completely before storing in an airtight container in the refrigerator for up to one week.
  • Prep Time: 10 minutes
  • Cook Time: 5 minutes
  • Category: Condiment
  • Method: Stovetop
  • Cuisine: American

Nutrition

  • Serving Size: 1 tablespoon (15g)
  • Calories: 50
  • Sugar: 12g
  • Sodium: 70mg
  • Fat: 0g
  • Saturated Fat: 0g
  • Unsaturated Fat: 0g
  • Trans Fat: 0g
  • Carbohydrates: 13g
  • Fiber: 0g
  • Protein: 0g
  • Cholesterol: 0mg

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