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What Is Subway Sweet Onion Sauce?

Have you been perusing the Subway menu only to discover the sweet onion sauce? Wondering what it is exactly and what to expect ordering it in your footlong or 6 incher? Well, here is all you need to know.

So, what is Subway sweet onion sauce? The sweet onion sauce at Subway is a low fat, sweet and flavourful condiment made from onions and other spices. It is one of the signature sauces on the menu designed to be added to most of the Subway sandwiches or as a dressing for one of their salads.

The clue is in the title really.

Nevertheless, this is a very popular sauce.

It is not perhaps as versatile as some of the other sauces on the menu but it certainly is worth a try.

But what is this sauce made of, what is the nutrition and what does it taste like?

Let’s find out!

What Is Subway Sweet Onion Sauce Made Of?

Subway Sweet Onion sauce is made of a combination of sugar, water, vinegar, corn starch onion juice, and a number of different spices.

Here is the full ingredient list, taken directly from Subways product ingredient list resource, for reference:

Sugar, Water, Vinegar, Corn starch, Modified corn starch, Salt, Dehydrated
onion, Mustard flour, Poppy seed, Onion juice, Spices, Potassium sorbate, Sodium benzoate,
Dehydrated red bell pepper, Cucumber juice, Celery seed. Contains Mustard

Remember, each ingredient is listed in relation to how much is in the sauce.

Equally, this is a universal recipe and one that will be used at all restaurant chains of Subway internationally.

Subway Sweet Onion Sauce Nutrition

Below you will find the full nutritional breakdown of the sweet onion sauce, per serving (18g)

– of which saturated0g
– of which trans0g
– of which sugars7g

Just consider here that serving sizes can vary depending on the size of Sub ordered, how much the member of staff uses, etc.

What Does Subway Sweet Onion Sauce Taste Like?

Subways sweet onion sauce tastes as the name suggests. It is very sweet and has a somewhat tangy aftertaste. It is very flavorful and relatively rich – a little tends to go a long way.

As such, it pairs particularly well with tuna, chicken, or turkey subs.

Another popular pairing among Subway customers appears to be along with the honey mustard sauce.

It’s not something you’re going to want to add to your meatball marinara, pizza sub melt, or steak and cheese!

But other than that, it does seem to pair particularly well with the other menu items.

Besides, the sweet onion Teriyaki chicken is a testament to its combination with chicken and lean meats in general!

Can You Buy Subway Sweet Onion Sauce?

It is not currently possible to buy Subway Sweet Onion sauce. You can only order it in-store and have it directly added to your sandwich or salad. While some stores do offer sauces for sale, sweet onion is not typically one of them.

In fact, some Subway stores do what is known as ‘Subway Grocery’.

This essentially allows customers to buy some of their sauces, in a sauce bag.

However, you will only typically find the mayonnaise, mustard, marinara, teriyaki, ranch, or chipotle.

There is always the option to ask for more sweet onion sauce specifically, but that will be at the discretion of the staff.

That being said, there is another branded sauce that tastes very similar to that of Subway.

And you can get it directly on Amazon.

Here is what one customer said about it, for reference:

And if you look at the ingredient list, you can see why it tastes so similar.

So, if you do end up being a big fan of this sauce, in particular, rest assured, you can order some easily online.


Subway sweet onion sauce is basically as it sounds.

It’s sweet, and it’s primarily onion flavored.

So do give it a try.

You may end up loving it, after all.

And if you want to try making it, then check out my copycat Subway Sweet Onion Sauce Recipe.

Related Questions

How Many Calories In Subway Sweet Onion Sauce?

There are 30 calories per serving (18g) of Subway Sweet Onion Sauce.