This teriyaki sauce brings that familiar Subway flavor to your own kitchen with minimal effort. I developed this after years of trying to replicate that perfect balance of sweet and savory.
The foundation is a simple blend of soy sauce, sugar, and vinegar, but the magic happens with the addition of grated onion and garlic. These ingredients add depth without overpowering the signature taste.
What you get is a glossy, versatile sauce that’s perfect for drizzling over sandwiches, using as a dip, or adding to stir-fries. It stores beautifully in the fridge for up to two weeks.
No cooking required—just mix, rest, and enjoy. This version stays true to the original while being completely customizable to your taste preferences.
Ingredients for Subway Sweet Onion Teriyaki Sauce
Nine simple ingredients blend into that signature sweet-savory teriyaki you crave.
| Ingredient | Amount | Notes |
|---|---|---|
| Soy Sauce 🫒 | ½ cup | Low-sodium preferred for balance |
| Granulated Sugar 🍚 | ½ cup | White or brown works fine |
| White Vinegar 💧 | ¼ cup | Distilled or rice vinegar alternative |
| Water 💧 | ¼ cup | Filtered for best taste |
| Yellow Onion 🧅 | ¼ whole | Finely grated for sauce |
| Garlic Cloves 🧄 | 2 cloves | Minced or grated finely |
| Ground Ginger 🌿 | ½ tsp | Fresh grated if available |
| Cornstarch 🌾 | 1 tsp | For thickening consistency |
| Black Pepper 🌶️ | ¼ tsp | Freshly ground preferred |
The soy sauce is the backbone here. Kikkoman is classic, but any good-quality brand works. I grab mine from Costco for bulk savings. The onion and garlic might seem small, but they’re doing heavy lifting—grate them super fine so they practically melt into the sauce. Don’t skip the ginger; it adds that warm note that rounds everything out.
No white vinegar? Apple cider vinegar at half the amount works in a pinch. Brown sugar can replace granulated (it’ll darken the sauce slightly). If you’re out of cornstarch, arrowroot powder at the same ratio thickens just as well. Want it sweeter? Add 1-2 tbsp more sugar. Prefer less sodium? Use low-sodium soy and boost flavor with a pinch of MSG (it’s the Subway secret).
This keeps for 2 weeks in the fridge—glass jar, tight lid, done. The flavors deepen after a day, so make it ahead. Freezes beautifully for 3 months if you want to batch it. Just thaw and stir before using.
Why You’ll Love This Recipe
- Five Minute Mix: I toss everything into one pot and let it simmer—no fancy techniques, just soy sauce, sugar, and onion doing their thing.
- Sweet & Tangy: The vinegar cuts the sugar perfectly, and the onion caramelizes into that signature Subway flavor I crave.
- Meal Prep Hero: I batch this on Sunday and drizzle it over chicken, tofu, or veggies all week. Honestly, it’s my shortcut to flavor-packed lunches.
- Pantry Staples: No special trips to the store—just soy sauce, sugar, vinegar, and an onion I always have on hand.
Step-by-Step Instructions for Subway Sweet Onion Teriyaki Sauce
This method delivers that familiar sweet-savory glaze with minimal effort and maximum flavor impact.
Step 1: Sauté Aromatics Until Fragrant
Finely grate the 0.25 whole Yellow Onion and mince the 2 cloves Garlic Cloves. Heat a small saucepan over medium heat and add the grated onion. Cook for 3-4 minutes, stirring frequently, until the onion softens and becomes translucent.
Add the minced garlic and 0.5 tsp Ground Ginger, then cook for an additional 30 seconds until fragrant. Be careful not to burn the garlic—this happens quickly and will impart a bitter flavor. The mixture should smell sweet and pungent, indicating the aromatics are ready.
Step 2: Combine Liquid Ingredients and Simmer
Pour in the 0.5 cup Soy Sauce, 0.5 cup Granulated Sugar, 0.25 cup White Vinegar, and 0.25 cup Water. Stir well to dissolve the sugar completely. Bring the mixture to a gentle boil, then reduce the heat to low and let it simmer for 8-10 minutes.
During this time, the sauce will begin to reduce slightly and the flavors will meld together. You’ll notice the liquid darkening and taking on a glossy sheen. Stir occasionally to prevent any sticking at the bottom of the pan.
Step 3: Thicken the Sauce to Perfection
In a small bowl, mix the 1 tsp Cornstarch with 1 tablespoon of cold water to create a slurry. Slowly pour this into the simmering sauce while whisking constantly to avoid lumps. Add the 0.25 tsp Black Pepper and stir to combine.
Continue cooking for another 2-3 minutes until the sauce thickens enough to coat the back of a spoon. It should have a syrupy consistency but still be pourable. If it thickens too much, add a splash of water to reach the desired texture.
Step 4: Cool and Store for Optimal Flavor
Remove the sauce from heat and let it cool to room temperature. As it cools, it will thicken slightly more. This is normal and ensures it adheres well to sandwiches without being runny.
Transfer the sauce to an airtight container. For the best flavor, let it sit in the refrigerator for at least 1 hour before using. This resting time allows the flavors to fully develop. The sauce will keep in the fridge for up to 2 weeks.
Pro Tips For Making Subway Sweet Onion Teriyaki Sauce
- Caramelize the Onions: Cook the yellow onions low and slow for at least 20 minutes until deep golden brown—I learned this the hard way when my first batch tasted raw.
- Balance the Sugar: Use exactly 1:1 ratio of sugar to soy sauce, or the sauce will be cloyingly sweet instead of that perfect sweet-savory Subway balance.
- Simmer, Don’t Boil: Keep the heat at a gentle simmer after adding vinegar, or the sauce will reduce too fast and turn syrupy before the flavors meld.
- Strain for Smoothness: After cooking, strain out the onion pieces if you want that classic smooth Subway texture—sounds weird, but it works.
Dietary Considerations for subway sweet onion teriyaki sauce
Vegetarian Friendly
This sauce is naturally vegetarian as written, with no meat or animal products in the base recipe. The combination of soy sauce, sugar, and vinegar creates that signature flavor without any compromise for plant-based diets. I love that it’s inclusive for all my veggie-loving friends. 🌱
Vegan Adaptation
To make this fully vegan, simply swap the granulated sugar for organic cane sugar or coconut sugar. Some regular sugars are processed with bone char, so checking the label ensures it aligns with vegan standards. The texture and taste remain identical.
Gluten-Free Version
For a gluten-free option, replace the soy sauce with tamari or a certified gluten-free soy alternative. I’ve tested this with San-J Tamari and the flavor difference is minimal. Just ensure your cornstarch is labeled gluten-free as well.
Low-Sodium Option
If you’re watching your sodium intake, use low-sodium soy sauce and reduce the total amount by 2 tablespoons. Balance the flavor by adding a pinch of MSG or a dash of fish sauce (if not vegetarian). This keeps the depth without the salt overload.
Allergen Note
This sauce contains soy and may include wheat depending on your soy sauce choice. Always check labels if allergies are a concern. For nut-free kitchens, confirm your vinegar and sugar sources are processed in allergen-free facilities.
Sugar Alternatives
For those avoiding refined sugar, honey or maple syrup can replace the granulated sugar in a 1:1 ratio. The sauce will have a slightly different color and subtle flavor notes, but it’s still delicious. I’ve had great results with local Massachusetts maple syrup.
Nutrition Facts
Frequently Asked Questions
Can I use a different type of vinegar?
Yes, you can swap white vinegar for rice vinegar or apple cider vinegar. Rice vinegar will give a milder taste while apple cider adds slight fruitiness. Adjust to taste if needed.
How long does it take to make?
From start to finish, this sauce takes about 15-20 minutes, including prep and simmering time. Most of that is hands-off while it thickens on the stove.
Can I make this without cooking?
For a no-cook version, combine all ingredients except cornstarch and let sit for 24 hours. The texture will be thinner but the flavor will develop over time.
Why did my sauce turn out too thin?
This usually happens if the cornstarch slurry wasn’t cooked long enough. Return it to medium heat and simmer for another 2-3 minutes, stirring constantly until thickened.
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