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1. Combine the Base Ingredients:
– In a medium mixing bowl, combine the mayonnaise and apple cider vinegar. Whisk together until smooth.
2. Add the Sweetness:
– Gradually add the sugar to the mixture while whisking continuously until fully dissolved.
3. Incorporate the Flavorings:
– Add the soy sauce, garlic powder, onion powder, black pepper, salt, paprika, and mustard powder to the bowl. Mix well until all ingredients are thoroughly combined.
4. Adjust Consistency:
– If you prefer a thinner sauce, gradually add water, one tablespoon at a time, until you reach your desired consistency.
5. Chill the Sauce:
– Cover the bowl with plastic wrap or transfer the sauce to an airtight container. Refrigerate for at least 30 minutes to allow the flavors to meld.
6. Serve:
– Use the sweet onion sauce on your favorite sandwiches, salads, or as a dipping sauce.
Prep Time: 10 minutes | Cook Time: 0 minutes | Servings: About 1 cup
Enjoy this delicious and versatile Subway Sweet Onion Sauce, perfect for elevating your meals! 
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