Servings: You will get 1 cup of sauce, making 16 servings (1 tablespoon each).
Subway Sweet Onion Sauce
Missing Subway’s sweet onion sauce? Make it at home in 15 mins—lasts forever! Perfect for sandwiches. Easy, tasty copycat recipe.
Ingredients
- ½ cup (120ml) cold water
- 6 tbsp white vinegar
- 2 tbsp red wine vinegar
- 1 drop sesame oil up to 2 drops
- 2½ tsp Dijon mustard
- ¾ tsp fresh onion juice use a garlic press
- 1 cup (200g) granulated sugar
- 1 tbsp arrowroot
- 1 tbsp minced onion flakes
- 2½ tsp mustard powder
- ½ tsp celery seed
- 1 tsp poppy seed
- 1 tsp salt
- ¼ tsp garlic salt plus 1/8 teaspoon
- ¼ tsp paprika plus 1/8 teaspoon
- ¼ tsp black pepper
Instructions
- Combine the ingredients by whisking them all together.
- Bring the mix to boil in a small saucepan over medium-high heat, Whisk frequently to avoid burning.
- Lower the heat and simmer whisking until the mixture thickens.
- Let it cool and place in the fridge consuming it within one month; or freeze.
Notes
Recipe Notes:
- Storage: Keeps 1 month refrigerated or 3+ months frozen (thaw before use).
- Thickener Swap: Arrowroot = cornstarch (1:1).
- Vinegar: All white vinegar works if no red wine vinegar.
- Onion Juice: Grate onion & squeeze pulp for juice (or use ½ tsp onion powder in a pinch).
- Sesame Oil: Optional—adds subtle depth, but can be skipped.
- Spices: Celery/poppy seeds add texture but aren’t essential.
- Adjust Sweetness/Tang: Add more sugar or vinegar to taste.
- Texture: For a smoother sauce, blend after it has cooled.
-