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    You are Here: Masala Herb » Recipes » Sauces and Dressings

    Sweet Onion Sauce Recipe

    Published: Aug 6, 2018 · Modified: Jun 27, 2022 by Helene Dsouza

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    Helene Dsouza
    DIY Sweet onion sauce recipe - easily prepared from scratch with real ingredients and no artificial preservatives. Store in clean sterilized jars or sauce bottles. Fake Subway copycat recipe, you can use the onion sauce in soups, salad dressings as a meat or fries dip.
    Total Time: 20 minutes
    4.41 from 10 votes
    Jump to Recipe
    Easy Sweet Onion Sauce Recipe

    Sweet Onion Sauce is my take on the onion sauce that you get at Subway.

    I have modified the sauce so that it can be used beyond subs and sandwiches.

    Easy Sweet Onion Sauce Recipe
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    How to use the Onion Sauce?

    The fake Subway Sweet Onion Sauce can be also used as a dipping sauce.

    As part of a salad dressing, as well as in soups and sauces with meals as it adds easily flavors to dishes.

    I call my Subway Sweet Onion Sauce a fake copycat recipe because it's used beyond a topping for subs.

    Besides that, I have modified the ingredients used and the looks to make it rather mild but smooth as well and not that dominating.

    Therefore this sauce can be used for other dishes as well and its uses are not limited anymore!

    The popular Sandwich food chain Subway uses (most probably) dark vinegar such as balsamic vinegar to add the strong sub-flavors.

    I, on the other hand, use Rice Vinegar to give it a subtle feel so that the vinegar doesn't overpower the mild white onions.

    Sweet Onion Sauce Ingredients

    Sweet Onion Sauce Ingredients include only fresh ingredients and is prepared with a natural preservation technique.

    Vinegar and Sugar help to preserve the Sauce.

    White Onions

    Pick a sweet, young and small variety of white onions.

    Those tend to be milder but turn out more flavorful as well.

    Garlic

    You can't skip the garlic, it adds flavors and helps the sauce to preserve.

    Sugar

    You can choose between regular sugar or brown sugar if you feel adventurous.

    Easy Sweet Onion Sauce Recipe

    Vinegar

    A very important element of the sweet onion sauce.

    Pick a white mild vinegar such as rice vinegar or regular distilled vinegar.

    Or use a 50:50 mixture of balsamic vinegar and apple cider vinegar for stronger flavors to mimic the copycat Subway onion sauce all the more.

    Seasoning

    Salt and Black Pepper for the flavor, and the Pepper add some texture too because the sauce is translucent.

    Corn Flour Slurry

    A slurry is a mixture of cornflour and water to thicken the sauce.

    Lime Juice

    The Lime Juice ads a fresh touch to the juice and it rounds up all the flavors in the sauce.

    How to make it?

    To prepare this sandwich sauce is fairly simple.

    Follow the steps easily to make a fresh batch of sweet onion sauce at home.

    Step 1

    Blend peeled onions + garlic with water smooth.

    Blend peeled onions + garlic with water smooth.

    Step 2

    Cook onion blend with vinegar, sugar, and seasoning.

    prepare and cook sweet onio sauce

    Step 3

    Create a slurry with cornflour and water and mix into the sauce. Mix in lemon juice, store in a jar.

    Create slurry with cornflour and water and mix into sauce. Mix in lemon juice, store in a jar.
    Easy Sweet Onion Sauce Recipe

    Storing

    As you can see, you don't need special bottles to store this sweet onion sauce.

    I like to store my sauces in bottles but if I am out of bottles but need sauce (and that turns into a craving) I am bound to just prepare my sauce and store it in clean sterilized regular jam jars.

    No judgment and it does the job as well!

    So you can just grab your usual jars which you use to make jam and fill it up with the sauce.

    To take out sauce I just use a spoon and due to the fact that it is a short jar, I can easily find a spot to store my fake subway sauce in my fridge.

    I tend to avoid bottles because they take up my precious door space and I don't like to lie down bottles.

    Sweet Onion Sauce dietary specification

    1. Gluten-free
    2. Vegan
    3. Lactose-free
    4. Preservative-free
    Easy Sweet Onion Sauce Recipe

    Sweet Onion Sauce Uses:

    • Classic in Subs, Sandwiches
    • As a dipping sauce for cooked meat, veggies, fried potato dishes
    • As a Sweet Onion Dressing Vinaigrette
    • In soups as a garnish
    • In Mash Potato

    More homemade Sauce Recipes:

    • Thai Sweet Chili Sauce
    • Big Mac Sauce
    • Mango Habanero Hot Sauce
    • Yum Yum Steak Sauce
    • Vegan Burger Sauce by knowyourproduce.com

    Dear Reader, How are you planning to use this sweet onion sauce?

    Easy Sweet Onion Sauce Recipe
    Recipes from around the world E-Book

    Global Food Recipes

    with Spices and Herbs

    Free E-Book available for a limited time. Grab yours now and get instantly inspired!

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    Easy Sweet Onion Sauce Recipe

    Easy Sweet Onion Sauce Recipe

    DIY Sweet onion sauce recipe - easily prepared from scratch with real ingredients and no artificial preservatives. Store in clean sterilized jars or sauce bottles. Fake Subway copycat recipe, you can use the onion sauce in soups, salad dressings as a meat or fries dip.
    4.41 from 10 votes
    Print Pin Rate
    Course: Condiment
    Cuisine: American
    Keyword: how to make sweet onion sauce, sweet onion sauce recipe
    Prep Time: 5 minutes
    Cook Time: 15 minutes
    Total Time: 20 minutes
    Servings: 50 servings
    Calories: 10kcal
    Recipe by: Helene Dsouza

    Ingredients

    • 5.3 ounces White Onion about 7 small
    • 3 large Garlic
    • ¼ cup Water
    • ½ cup Sugar
    • 5.6 ounces Vinegar *see Note
    • ¼ Teaspoon Black Pepper
    • ¼ Teaspoon Salt
    • Juice of one lime

    For the Cornflour Slurry

    • 1 Tablespoon Cornflour
    • 3 Tablespoon Water
    US Customary - Metric

    Instructions

    • To your blender jar add your peeled onions, your garlic with the water.
    • Blend the content to a smooth consistency.
    • Prepare a saucepan and pour the smooth onion mixture into the pan. Heat up your pan and keep on slow heat.
    • Add the sugar and vinegar and mix well. Then season with black pepper and salt. Mix the content well.
    • Cook the sauce on slow heat until it gets translucent. That is a sign that it is cooked. Make sure to mix with a whisk frequently so to make sure that nothing burns on.
    • Mix cornflour and water to create a slurry. We need to do that because if you add the cornflour powder into the hot onion sauce directly, it will go lumpy.
    • Whisk the whole content while heating up so that the sauce thickens. Keep it on the thicker side so that you can add the lime juice at the end.
    • Pour in your lime juice but don't heat it up again because the heat modifies the flavor of the lime juice.
    • Store in a sterilized clean jar or sauce bottle in the fridge or in a cool and dry place.

    Notes

    1. Pick a sweet onion variety and small young onions for the best result
    2. For the Vinegar use a distilled or rice vinegar or us 50:50 balsamic and apple cider for a stronger flavor profile.
    3. Always work with clean sterilized jars and lids to kill all the germs. That way your sauce will remain good for a longer period in your fridge. Also, make sure your sauce cooked properly. Once it's translucent it's a good sign.
    4. The sugar in this sauce (besides the vinegar) helps the sauce to stay good without getting spoiled. Don't reduce the sugar amount!
    5. Do not add more water. Water will reduce the shelf life of your sauce.
    6. Cook the sauce to a thicker consistency if you prefer a thick sauce. However, remember, when the sauce is hot with the slurry added, it will always look more liquid and only when it cools down will you see how thick it gets.

    Nutrition

    Nutrition Facts
    Easy Sweet Onion Sauce Recipe
    Amount Per Serving (18 g)
    Calories 10 Calories from Fat 9
    % Daily Value*
    Fat 1g2%
    Saturated Fat 1g5%
    Sodium 12mg1%
    Potassium 5mg0%
    Carbohydrates 2g1%
    Fiber 1g4%
    Sugar 2g2%
    Protein 1g2%
    Vitamin C 0.2mg0%
    Calcium 1mg0%
    * Percent Daily Values are based on a 2000 calorie diet.
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