Subway Sweet Onion Sauce Recipe
Subway copycat sweet onion sauce recipe at home from scratch within 15 minutes. An easy, vegan, gluten-free, oil-free, recipe.
Servings1 cup
Calories:
INGREDIENTS ( 1 CUP = 240 ML )
- 1 medium-size onion
- 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/kalonji
- ¼ teaspoon black pepper, freshly ground or to taste
- ¼ teaspoon salt or to taste
- 2 teaspoon cornflour/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
Be sure to give the sauce a taste test to avoid over-seasoning.
Ingredient notes:
Onion: any sweet variety; Some popular sweet onion varieties include Walla walla, Texas sweets, Maui, and Vidalia. White or yellow onion will work as well.
Garlic: just a touch of fresh garlic to enhance the flavor. If fresh garlic is not available, you can use garlic powder instead.
Vinegar: plain white distilled vinegar and balsamic vinegar.
Granulated sugar: you can also use brown sugar.
Cornflour: cornflour or cornstarch to thicken the sauce. Arrowroot flour, tapioca flour/starch, or potato starch also work fine;
Black pepper powder: I recommend using freshly ground black pepper;
Nigella seed(also called kalonji): available in Asian grocery stores. It tastes like oregano and onion mix. It adds a hint of extra flavor. I like the flavor, but you can choose to skip it;
Lemon juice: fresh;
Salt: I use regular table salt.
Water: cold filtered water;