Subway Sweet Onion Sauce (Copycat)

READY IN: 13mins
Recipe by The Spice Guru

My reverse-engineered recipe for Subway's Sweet Onion Sauce, as requested by another member. It's quite sweet, but very tasty, if you've never tried it before.

Top Review by Tara M.

this taste just like subway sweet onion..i might never go back to

Ingredients Nutrition


  1. WHISK sauce ingredients together in a small saucepan (1 cup plus 2 tablespoons granulated sugar, 1/2 cup plus 1 tablespoon cold water, 6 tablespoons white vinegar, 1 1/2 tablespoons red wine vinegar, 1 tablespoon arrowroot powder, 1 tablespoon minced onion flakes, 2 1/2 teaspoons Dijon mustard, 2 1/2 teaspoons mustard powder, 3/4 teaspoon celery salt, 3/4 teaspoon fresh onion juice, 3/4 teaspoon poppy seeds, 1/2 teaspoon onion salt, 3/8 teaspoon garlic salt, 3/8 teaspoon paprika, 3/8 teaspoon black pepper, 1-2 drops sesame oil).
  2. BRING mixture to a boiling while whisking constantly.
  3. REDUCE heat to low simmer, stirring until thickened and flavorful, about 5 minutes.
  4. ALLOW to cool, then refrigerate in a sealed container (keeps indefinitely).
  5. SERVE as a dressing for sandwiches or salads and enjoy!

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