Homemade Sweet Onion Sauce
Recreate Subway’s famous Homemade Sweet Onion Sauce with this easy copycat recipe. This delightful sauce combines sweet and tangy flavors, making it perfect for sandwiches, salads, and dips. Whether you’re hosting a party or enjoying a quiet meal at home, this versatile sauce adds a unique touch to your dishes. Its simple preparation and fresh ingredients will make it a staple in your kitchen.
Why You’ll Love This Recipe
- Easy to Make: With just a few ingredients and minimal prep time, you can whip up this delicious sauce in no time.
- Versatile Flavor: This sauce pairs wonderfully with sandwiches, salads, and even grilled vegetables, enhancing the taste of various dishes.
- Fresh Ingredients: By making your own sweet onion sauce, you control the quality of the ingredients, ensuring a fresher flavor without preservatives.
- Perfect for Meal Prep: This sauce can be stored in the refrigerator for up to a week, making it great for meal prepping.
- Vegan-Friendly: Enjoy this delightful condiment without any animal products, making it suitable for vegan diets.
Tools and Preparation
Before diving into the cooking process, gather your essential tools. Having the right equipment makes preparing your Homemade Sweet Onion Sauce a breeze.
Essential Tools and Equipment
- Saucepan
- Whisk
- Measuring cups and spoons
- Airtight container
Importance of Each Tool
- Saucepan: A good saucepan helps evenly heat the ingredients, ensuring your sauce cooks perfectly without burning.
- Whisk: Using a whisk allows you to blend ingredients smoothly and prevents clumping while cooking.
- Airtight Container: Store your sauce in an airtight container to maintain freshness and prevent spoilage.
Ingredients
To create your own Homemade Sweet Onion Sauce, you’ll need the following ingredients:
Sweet Ingredients
- 1 Cup Sugar
- 1/2 Cup Water
Vinegars
- 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
Seasonings
- 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. Ensure that each ingredient is measured accurately for the best results.
Step 2: Cook the Mixture
Bring the mixture to a boil while whisking constantly. Let it boil for about 5 minutes. After boiling, reduce heat to simmer for another 5 minutes while continuing to whisk.
Step 3: Cool Down and Store
Remove the saucepan from heat and allow the sauce to cool completely. Once cooled, transfer it to an airtight container. Store in the refrigerator for up to 1 week for maximum freshness.
Enjoy your flavorful Homemade Sweet Onion Sauce as a perfect addition to various meals!
How to Serve Homemade Sweet Onion Sauce
Homemade Sweet Onion Sauce is a versatile condiment that can elevate many dishes. Its sweet and tangy flavor makes it an excellent addition to various meals, enhancing both taste and presentation.
On Sandwiches
- Subway-Style Sandwiches: Drizzle this sauce over your favorite sandwich for a taste reminiscent of Subway’s classic offerings.
- Wraps: Add a layer of sweetness to wraps, pairing perfectly with grilled chicken or veggies.
As a Salad Dressing
- Salads: Use the sauce as a dressing for fresh salads, adding depth to greens and toppings.
- Coleslaw: Mix it into coleslaw for a delightful twist on the traditional dressing.
With Grilled Meats
- Grilled Chicken: Brush over grilled chicken for extra flavor, making it juicy and delicious.
- Pork Chops: Serve alongside pork chops as a dipping sauce to enhance the savory taste.
On Vegetables
- Roasted Veggies: Drizzle over roasted vegetables to add sweetness and richness.
- Steamed Broccoli: A light coat of this sauce can elevate steamed broccoli, making it more appealing.

How to Perfect Homemade Sweet Onion Sauce
To ensure your Homemade Sweet Onion Sauce reaches its full potential, consider these tips:
- Flavor Enhancements: Experiment with adding more onion or garlic powder for stronger flavors.
- Adjust Sweetness: If you prefer less sweetness, reduce the sugar slightly while maintaining balance with vinegar.
- Consistency Control: For thicker sauce, increase cornstarch slightly; for thinner sauce, decrease it as needed.
- Chill Before Serving: Allowing the sauce to chill enhances its flavors and makes it perfect for serving.
Best Side Dishes for Homemade Sweet Onion Sauce
Pairing side dishes with your Homemade Sweet Onion Sauce can create delightful meal combinations. Here are some excellent choices:
- Sweet Potato Fries: These crispy fries provide a sweet contrast that complements the onion sauce beautifully.
- Grilled Corn on the Cob: Brush with butter and serve with the sauce on the side for a tasty summer treat.
- Rice Pilaf: Fluffy rice pilaf pairs well, allowing the sauce to soak in its flavors.
- Mixed Green Salad: Fresh greens topped with this sauce make for a refreshing side dish.
- Baked Potatoes: Load baked potatoes with this sauce instead of sour cream for an exciting twist.
- Veggie Sticks: Serve carrot and cucumber sticks as dippers alongside the sweet onion sauce.
Common Mistakes to Avoid
Making homemade sweet onion sauce can be a delightful experience, but there are common pitfalls to watch out for. Here are some mistakes to avoid:
- Using the wrong type of vinegar: The balance of flavors relies on the right vinegars. Stick to white and red wine vinegar for the best results.
- Not whisking constantly: If you don’t whisk while boiling, your sauce may clump or burn. Be sure to keep stirring for an even consistency.
- Skipping the cooling step: Allowing the sauce to cool before storing is crucial. Skipping this can lead to spoilage or altered flavors.
- Overcooking the sauce: Cooking it too long can make it too thick or caramelized. Follow the timing closely for perfect results.
- Ignoring storage instructions: Not storing your sauce properly can shorten its shelf life. Use airtight containers in the fridge for freshness.

Storage & Reheating Instructions
Refrigerator Storage
- Store in an airtight container to prevent contamination.
- Homemade sweet onion sauce lasts up to 1 week in the refrigerator.
Freezing Homemade Sweet Onion Sauce
- Use freezer-safe containers or bags.
- Frozen sauce can last up to 3 months, but may lose some texture upon thawing.
Reheating Homemade Sweet Onion Sauce
- Oven: Preheat to 350°F (175°C) and heat covered for about 10-15 minutes.
- Microwave: Heat in short intervals at medium power, stirring in between until warm.
- Stovetop: Warm over low heat, stirring frequently until heated through.
Frequently Asked Questions
Here are some common questions about making homemade sweet onion sauce:
Can I adjust the sweetness in Homemade Sweet Onion Sauce?
Yes, you can modify the sugar amount based on your taste preference. Reducing sugar will make it less sweet.
How long does Homemade Sweet Onion Sauce last?
Homemade sweet onion sauce stays fresh for one week when stored properly in an airtight container in the fridge.
Is Homemade Sweet Onion Sauce vegan?
Absolutely! This recipe contains no animal products, making it a great vegan condiment choice.
What dishes pair well with Homemade Sweet Onion Sauce?
This versatile sauce works well on sandwiches, salads, and as a dip for veggies or chips.
Final Thoughts
Homemade sweet onion sauce is not only easy to make but also incredibly versatile. You can customize it by adjusting ingredients like mustard or adding spices according to your preferences. We encourage you to try this recipe and enjoy a delightful addition to your meals!

Homemade Sweet Onion Sauce
- Total Time: 20 minutes
- Yield: Approximately 16 servings (240ml total) 1x
Description
Homemade Sweet Onion Sauce is a delightful blend of sweet and tangy flavors, reminiscent of the iconic Subway sauce. This easy copycat recipe is perfect for drizzling over sandwiches, salads, or even grilled meats, adding a burst of flavor to your meals. Made with fresh ingredients, this versatile condiment is free from preservatives and can be prepared in under 20 minutes. Whether you’re hosting a gathering or enjoying a casual dinner at home, this sauce will elevate any dish, making it a must-have staple in your kitchen.
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
- 1/2 Tablespoon Cornstarch
- 2 Teaspoons Dijon Mustard
- 2 Teaspoons Mustard Powder
Instructions
- Combine all ingredients in a saucepan.
- Bring to a boil while whisking constantly for about 5 minutes.
- Reduce heat and simmer for another 5 minutes, continuing to whisk.
- Remove from heat and allow to cool completely.
- Transfer to an airtight container and store in the refrigerator for up to one week.
- Prep Time: 10 minutes
- Cook Time: 10 minutes
- Category: Condiment
- Method: Sauce making
- Cuisine: American
Nutrition
- Serving Size: 1 tablespoon
- Calories: 50
- Sugar: 12g
- Sodium: 40mg
- Fat: 0g
- Saturated Fat: 0g
- Unsaturated Fat: 0g
- Trans Fat: 0g
- Carbohydrates: 13g
- Fiber: 0g
- Protein: 0g
- Cholesterol: 0mg