Description

This homemade Subway Sweet Onion Sauce replicates the beloved tangy and sweet condiment used in Subway sandwiches. Made with simple ingredients like sugar, vinegar, soy sauce, and minced onion, this sauce offers a perfect balance of sweetness and onion flavor, enhanced with garlic and onion powders and a hint of poppy seeds. It’s quick to prepare on the stovetop and can be used as a versatile sauce for sandwiches, wraps, grilled chicken, or salads.

Ingredients

Scale

Ingredients

½ cup white sugar
½ cup white vinegar
1 tablespoon cornstarch
2 tablespoons water
1 tablespoon soy sauce
1 tablespoon finely minced onion
½ teaspoon poppy seeds (optional)
¼ teaspoon garlic powder
¼ teaspoon onion powder
¼ teaspoon salt
⅛ teaspoon ground black pepper

Cook Mode Prevent your screen from going dark

Instructions

Combine sugar and vinegar: In a small saucepan, combine the white sugar and white vinegar over medium heat, stirring continuously until the sugar dissolves completely, creating a smooth liquid base for the sauce.
Prepare the cornstarch slurry: In a separate small bowl, mix the cornstarch with water to form a smooth slurry, which will be used to thicken the sauce.
Add seasonings and soy sauce: To the saucepan, add the soy sauce, finely minced onion, poppy seeds (if using), garlic powder, onion powder, salt, and ground black pepper. Stir well to ensure all ingredients are blended evenly.
Thicken the sauce: Slowly pour in the cornstarch slurry while continuously stirring the mixture in the saucepan. Continue cooking and stirring constantly for about 2 to 3 minutes, until the sauce thickens slightly to a smooth and glossy consistency.
Cool and store: Remove the saucepan from heat and allow the sauce to cool to room temperature. Transfer the sauce into an airtight container and refrigerate. It will keep fresh for up to 1 week.

Notes

This sweet onion sauce is excellent for enhancing sandwiches, wraps, grilled chicken, and can also be used as a flavorful salad dressing.
For a smoother and more uniform texture, you can blend the sauce with an immersion blender or regular blender after cooking and before cooling.
To keep the recipe gluten-free, use gluten-free soy sauce.
The sauce thickens more as it cools, so adjust the cooking time slightly if a thinner texture is preferred.