Subway Sweet Onion Sauce Recipe
User Reviews
5
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Prep Time
5 mins
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Cook Time
10 mins
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Total Time
15 mins
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Servings
1 cup
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Course
Side Dish, Condiments
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Cuisine
International
Subway Sweet Onion Sauce Recipe
Description
This recipe recreates the Subway Sweet Onion Sauce by blending medium-sized onion and garlic into a smooth puree and extracting juice through a muslin cloth. The juice is simmered with sugar, salts, vinegar varieties, black pepper, and nigella seeds to develop a balance of sweet and tangy flavors with a mild herbal undertone.
The sauce is thickened with a slurry made from cornflour and water, cooked until glossy and viscous, then finished with fresh lemon juice to brighten the flavor. The combination of sweet onion sweetness, vinegar acidity, and spice from nigella seeds contributes to a layered sauce that complements savory dishes.
Storing the sauce in an airtight container in the refrigerator preserves freshness and allows use as a flavorful topping on sandwiches or as a dip. Adjusting seasoning to taste before refrigerating ensures balanced flavor.
Ingredients
- 1 onion medium-size
- 2 garlic cloves
- ¾ cup water plus ¼ cup water
- ⅓ cup granulated sugar
- 1 teaspoon balsamic vinegar
- 1 teaspoon white vinegar
- ¼ teaspoon nigella seeds aka kalonji
- ¼ teaspoon black pepper or to taste, freshly ground
- ¼ teaspoon salt or to taste
- 2 teaspoon cornflour or cornstarch
- ½ teaspoon lemon juice fresh
Instructions
- Peel the onion and garlic, roughly chop them, and blend until look smooth. Squeeze the juice using a muslin cloth and transfer to a pan or pot.
- Heat the pan. Add in water, sugar, salt, white vinegar, balsamic vinegar, black pepper, and nigella seeds. Bring the mixture to a boil until sugar dissolves.
- Whisk ¼ cup water and cornflour together in a bowl, and make a slurry.
- Add the cornflour slurry and stir continuously over medium flame until the sauce thickens and looks glossier.
- Remove from heat and add lemon juice. Stir to mix and allow the sauce to come to room temperature.
- Store in an airtight container in the refrigerator and use when needed.
Notes
- Taste the sauce before final storage to adjust seasoning and prevent over-seasoning.
- Use any sweet onion variety such as Walla Walla, Texas sweets, Maui, or Vidalia for authentic sweetness; white or yellow onions also work.
- Fresh garlic is preferred for flavor; garlic powder can substitute if fresh is unavailable.
- White distilled vinegar and balsamic vinegar are used to provide acidity and depth.
- Brown sugar may replace granulated sugar for a different sweetness profile.
- Cornflour can be substituted with arrowroot, tapioca, or potato starch for thickening.
- Freshly ground black pepper enhances flavor better than pre-ground.
- Nigella seeds add a distinct oregano-onion flavor but can be omitted if unavailable.
- Use cold filtered water for best results in sauce preparation.
User Reviews
Overall Rating
5
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