Homemade Sweet Onion Sauce
Recreate Subway’s famous Homemade Sweet Onion Sauce with this easy copycat recipe. This sauce is a perfect blend of sweet and tangy flavors, making it an ideal addition to sandwiches, salads, and wraps. Whether you’re hosting a casual gathering or preparing a quick meal at home, this sauce will elevate your dishes with its unique taste.
Why You’ll Love This Recipe
- Quick and Easy: This sauce comes together in just 15 minutes, making it a convenient option for busy days.
- Versatile Flavor: Perfect for drizzling on sandwiches, salads, or as a dip for veggies; its sweet and tangy notes complement many dishes.
- Homemade Goodness: You can control the ingredients, ensuring freshness and avoiding preservatives found in store-bought versions.
- Customizable: Feel free to adjust the sweetness or tanginess to suit your personal preference.
- Vegan-Friendly: This recipe uses plant-based ingredients, making it suitable for various dietary needs.
Tools and Preparation
Before you start making your Homemade Sweet Onion Sauce, gather all necessary tools. Having everything ready will make the process smoother.
Essential Tools and Equipment
- Saucepan
- Whisk
- Airtight container
- Measuring cups and spoons
Importance of Each Tool
- Saucepan: Essential for cooking the sauce on the stove. A non-stick option makes stirring easier.
- Whisk: Helps ensure all ingredients are evenly mixed while preventing clumps.
- Airtight container: Perfect for storing your sauce in the refrigerator, keeping it fresh longer.
Ingredients
To create this delightful Homemade Sweet Onion Sauce, you’ll need:
- 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.
Step 3: Simmer
Reduce heat to simmer for another 5 minutes, whisking continuously to avoid lumps.
Step 4: Cool and Store
Remove from heat and allow to cool. Store in an airtight container in the refrigerator for up to one week.
Enjoy your homemade sweet onion sauce on sandwiches, salads, or as a flavorful dip!
How to Serve Homemade Sweet Onion Sauce
Homemade Sweet Onion Sauce is versatile and adds a delicious twist to many dishes. Here are some creative ways to serve this delightful sauce that will enhance your meals.
On Sandwiches
- Classic Deli Sandwich: Drizzle the sauce over turkey or ham for a flavorful kick.
- Veggie Delight: Spread on a veggie sandwich for a tangy addition to fresh vegetables.
As a Salad Dressing
- Mixed Greens: Toss your salad with sweet onion sauce for a unique, sweet flavor.
- Coleslaw: Mix into coleslaw for an extra layer of taste that complements the crunch.
With Grilled Meats
- Grilled Chicken: Brush on grilled chicken breasts right before serving for added moisture and flavor.
- Burgers: Use as a topping for burgers to elevate your classic cookout.
Dipping Sauce
- Veggie Platter: Serve with fresh vegetables as a tasty dipping option.
- Chicken Nuggets: Pair it with chicken nuggets for an unexpected yet delightful dip.
As a Marinade
- Marinade for Fish: Use as a marinade for fish before grilling to infuse flavor.
- Tofu Marinade: Marinate tofu in this sauce for a sweet-savory dish.

How to Perfect Homemade Sweet Onion Sauce
To achieve the best flavor and consistency of your Homemade Sweet Onion Sauce, consider these helpful tips.
- Fresh Ingredients: Always use freshly grated onion to enhance the sauce’s flavor profile.
- Whisk Constantly: Whisking while cooking ensures even blending and prevents lumps from forming.
- Adjust Sweetness: Feel free to adjust the sugar based on your taste preferences; less sugar can yield a bolder onion flavor.
- Store Properly: Keep the sauce in an airtight container in the fridge to maintain freshness up to one week.
- Experiment with Vinegars: Try different types of vinegar for unique twists on the classic recipe, such as apple cider vinegar.
Best Side Dishes for Homemade Sweet Onion Sauce
Pairing side dishes with your Homemade Sweet Onion Sauce can elevate any meal. Here are some great options:
- bold French Fries: Crispy fries make an excellent base for drizzling or dipping in sweet onion sauce.
- bold Potato Salad: A creamy potato salad pairs wonderfully with the tangy flavors of sweet onion sauce.
- bold Grilled Vegetables: Charred vegetables are enhanced by the sweetness of this sauce, adding depth to each bite.
- bold Macaroni and Cheese: Stirring in some sweet onion sauce can transform classic mac and cheese into something special.
- bold Baked Wings: Toss baked chicken wings in sweet onion sauce before serving for an irresistible glaze.
- bold Rice Pilaf: Drizzle over rice pilaf to elevate its flavor profile with sweetness and tanginess.
Common Mistakes to Avoid
Avoiding common mistakes can make your Homemade Sweet Onion Sauce even better. Here are some pitfalls to watch for:
- Using the wrong vinegar: Different vinegars have distinct flavors. Stick to white and red wine vinegar for the best balance.
- Skipping the whisking: Not whisking constantly can lead to lumps. Always whisk as you boil and simmer for a smooth sauce.
- Overcooking: Cooking too long can alter the flavor. Follow the timing closely for optimal sweetness and tanginess.
- Not storing properly: If you don’t use an airtight container, your sauce may spoil faster. Store it correctly to maintain freshness.

Storage & Reheating Instructions
Refrigerator Storage
- Store your Homemade Sweet Onion Sauce in an airtight container.
- It will stay fresh in the fridge for up to one week.
Freezing Homemade Sweet Onion Sauce
- You can freeze this sauce for longer storage.
- Use freezer-safe containers or bags and label them with the date.
- It can be frozen for up to three months.
Reheating Homemade Sweet Onion Sauce
- Oven: Preheat to 350°F (175°C) and heat in a covered oven-safe dish until warm.
- Microwave: Heat in short intervals, stirring in between, until warmed through.
- Stovetop: Warm over low heat, stirring frequently to prevent sticking.
Frequently Asked Questions
Here are some common questions about making Homemade Sweet Onion Sauce.
What is Homemade Sweet Onion Sauce used for?
Homemade Sweet Onion Sauce is great as a dip, marinade, or sandwich spread. Its sweet and tangy flavor complements various dishes.
Can I customize my Homemade Sweet Onion Sauce?
Absolutely! You can adjust sweetness or add spices like cayenne for heat. Experimenting makes it uniquely yours!
How long does Homemade Sweet Onion Sauce last?
When stored properly, it lasts up to one week in the refrigerator and three months when frozen.
Is this sauce vegan?
Yes, this Homemade Sweet Onion Sauce is completely vegan-friendly! Enjoy it without any animal products.
Final Thoughts
This Homemade Sweet Onion Sauce is a delightful blend of sweet and tangy flavors that enhances any meal. Try it on sandwiches, salads, or as a dip. Feel free to customize it to suit your taste preferences!

Homemade Sweet Onion Sauce
- Total Time: 15 minutes
- Yield: Approximately 12 servings (360g total) 1x
Description
Elevate your culinary creations with this Homemade Sweet Onion Sauce, a delightful blend of sweet and tangy flavors reminiscent of Subway’s iconic dressing. Perfect for drizzling on sandwiches, salads, and wraps, this easy copycat sauce will add a unique twist to your meals.
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 to a boil while whisking constantly; let it boil for 5 minutes.
- Reduce heat to simmer for an additional 5 minutes while whisking continuously.
- Remove from heat and cool before transferring to an airtight container.
- Prep Time: 10 minutes
- Cook Time: 5 minutes
- Category: Condiment
- Method: Cooking
- Cuisine: American
Nutrition
- Serving Size: 30g
- Calories: 80
- Sugar: 16g
- Sodium: 90mg
- Fat: 0g
- Saturated Fat: 0g
- Unsaturated Fat: 0g
- Trans Fat: 0g
- Carbohydrates: 20g
- Fiber: 0g
- Protein: <1g
- Cholesterol: 0mg