Syn Free French Onion Soup | Slimming World

This Slimming World friendly, Syn Free French Onion soup takes no time at all in the Instant Pot!

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Syn Free French Onion Soup | Slimming World

For the full list of ingredients and comprehensive instructions, please see the recipe card at the end of this post. Before you scroll, there’s important stuff in the blurb 👍

Nothing beats the mouth-watering flavour of cooked onions, and this Syn Free French Onion Soup has bags of sweetness to boot. The flavours are really intense and the garlic adds an extra depth to the taste.

Syn Free French Onion Soup | Slimming World

Soups are a great way to pack in a load of speed foods for a Syn free lunch.

This Syn Free French Onion Soup is also a one pot wonder, and is super easy to make.

Syn Free French Onion Soup | Slimming World

You can also make this in a slow cooker, but you’d need to brown the onions in a frying pan first.

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If you make this Syn Free French Onion Soup recipe, snap a pic and hashtag it #pinchofnom — We love to see your creations on Instagram, Facebook, & Twitter!

Syn Free French Onion Soup | Slimming World

What do I need to make this Syn Free French Onion Soup?

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This soup is really simple to make, with no blending or blitzing required.

You will need an Instant Pot

The Instant Pot is like a slow cooker/pressure cooker hybrid and is probably one of our favourite kitchen gadgets.

You can cook stews and soups in it in a quarter of the time it would take in a slow cooker! This Syn Free French Onion Soup takes 5 minutes in the Instant Pot, but would take about 2 hours in a slow cooker!

We have loads of Instant Pot recipes such as this delicious Syn Free Caribbean Jerk Stew!

Syn Free French Onion Soup | Slimming World

How many Syns are in this Syn Free French Onion Soup?

As the title suggests, this Syn Free French Onion Soup is…Syn Free! In fact it is packed full of Speed Food!
Syn Free French Onion Soup | Slimming World

There are a few things you can use to garnish this soup. We like to toast a slice of Healthy Extra B bread, topped with some Healthy Extra A Reduced Fat Emmental.

Syn Free French Onion Soup | Slimming World
Whatever you choose don’t forget to check the Syn value and adjust it accordingly.

How do I make this Syn Free French Onion Soup?

Step 1

Slice the onions and garlic finely. Set the Instant Pot to Sauté, spray the inner with Frylight and brown the onions and garlic.

Syn Free French Onion Soup | Slimming World

Do not stir too frequently, you want the bottom to brown to give the soup extra colour.

Syn Free French Onion Soup | Slimming World

Step 2

Add the balsamic vinegar and Worcestershire Sauce and stir. Pour in all of the water and add the beef stock cubes and vegetable stock pot. Press the “off” button.

Syn Free French Onion Soup | Slimming World

Step 3

Put the lid on, ensure the pressure valve is closed, and press the “Manual” button. The Instant Pot may take a little while to come up to pressure as there is quite a lot of liquid in there!

Step 4

Once the Instant Pot has beeped to let you know it has finished, quick release the pressure (careful not to get in the way of the releasing steam!). Serve the soup with a garnish of your choice!

Syn Free French Onion Soup | Slimming World

Whenever we need to replace oil in cooking we use Frylight. Perfect for everyday frying and cooking, it delivers exactly one calorie per spray, which makes it Syn free! We used the Olive Oil one for this Syn Free French Onion Soup recipe, and it was fab!

Frylight Syn Free French Onion Soup | Slimming World

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Syn Free French Onion Soup | Slimming World

Votes: 5
Rating: 4
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Servings

Prep Time

Cooking Time

people 5 minutes 20 minutes

Calories

Weight Watchers

Slimming World 

78kcal 2

Smart Points (Flex/Freestyle)

Zero

Syns

Per people Per people Per people
Suitable For Freezing icon Gluten Free icon Dairy Free icon
INGREDIENTS
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INSTRUCTIONS
  1. Slice the onions and garlic finely. Set the Instant Pot to Sauté, spray the inner with Frylight and brown the onions and garlic. Do not stir too frequently, you want the bottom to brown to give the soup extra colour. This will take around 10 minutes.
  2. Add the balsamic vinegar and Worcestershire Sauce and stir. Pour in all of the water and add the beef stock cubes and vegetable stock pot. Press the "off" button.
  3. Put the lid on, ensure the pressure valve is closed, and press the "Manual" button. Change the time to 5 minutes. The Instant Pot may take a little while to come up to pressure as there is quite a lot of liquid in there!
  4. Once the Instant Pot has beeped to let you know it has finished, quick release the pressure (careful not to get in the way of the releasing steam!). Serve the soup with a garnish of your choice!

If you make this recipe, snap a pic and hashtag it #pinchofnom — We love to see your creations on InstagramFacebook, & Twitter!

RECIPE NOTES

We use a fan assisted oven for all of our recipes. Need help converting the temperature for your oven? 

Click here for our oven temperature conversion guide.

This recipe can be frozen, but please remember to do the following;

- Freeze it as soon as it is cold enough.
- Use a container or bag that is suitable for freezing.
- Defrost thoroughly before reheating (you can use the defrost setting on your microwave.)
- Make sure it is piping hot all the way through before serving.

If making this recipe Gluten Free please make sure to check the ingredients that you’re using

Especially things such as; 

- Stock cubes
- Soy sauce - substitute with Tamari.
- Worcestershire sauce - substitute with Henderson’s Relish.
- Etc.

IMPORTANT INFORMATION

Syn values given are correct at time of writing but may not always be accurate.

This website is UNOFFICIAL and in NO WAY part of or representative of Slimming World. 

We aren’t trained by Slimming World nor authorised to give Slimming World advice. Any advice given here should not replace the advice of your Slimming World consultant.

Ideally, you should check with Slimming world for the most up to date Syn values using official resources such as; the Syns calculator, Syns Online on LifelineOnline or by calling the Syns Hotline on (0906) 851 8518.

Although pinchofnom.com attempts to provide accurate nutritional information, these figures should be considered estimates. Varying factors such as product types or brands purchased, natural fluctuations in fresh produce, and the way ingredients are processed change the effective nutritional information in any given recipe. Under no circumstances will pinchofnom.com be responsible for any loss or damage resulting for your reliance on nutritional information.

We kindly ask that you share this recipe via the share buttons and not via screenshots. 

As our recipes change often in accordance with syn value changes, we want to ensure that they're as accurate as possible at all times. 

If you use or re-create our recipes we kindly ask:

  • That you credit us by not only screenshot but linking to our original recipe post
  • You don't reproduce the recipe in full
20 Comments
    1. Hi Ceri
      Brown the onions and garlic as described in step 1.
      Add balasmic and Worcestershire sauce and stir.
      Transfer to a large saucepan, add water, beef stock cubes and stock pot.
      Simmer with lid on for approx 20 mins, stirring occasionally. Then remove lid and simmer for another 5 mins if you want your soup a little thicker.
      Serve as described in the recipe.

    1. Hi Tracy
      Brown the onions and garlic as described in step 1.
      Add balasmic and Worcestershire sauce and stir.
      Transfer to a large saucepan, add water, beef stock cubes and stock pot.
      Simmer with lid on for approx 20 mins, stirring occasionally. Then remove lid and simmer for another 5 mins if you want your soup a little thicker.
      Serve as described in the recipe.

    1. Hi Sharon
      It’s easier on the hob, if you don’t have an Instant Pot. (I’ve given instructions in a couple of answers further up!)
      For the slow cooker – follow the making instructions for step 1 and 2 in a large frying pan on hob, minus the water. Transfer to slow cooker, add water and cook on high for approx 3 hrs, leaving lid off for at least the last 30 mins to allow soup to thicken.

  1. Could you do this in a soup maker or would not be the same without frying the onion and garlic? Can you recommend a cheaper version of the instant pot? I looked at them on Amazon but very expensive! There are alternatives but which one?!! Haha! Thanks in advance. 😀

    1. Hi Sarah
      Frying the onion and garlic helps to develop the flavour. You could complete this part on the hob then transfer ingredients to the soup maker.
      Most of the PoN team have an Instant Pot. It’s THE most versatile and useful kitchen gadget I own!! It has many functions, including saute, rice, pressure cooking and slow cooking.
      The beauty of that is you can cook an entire meal in the one pot.You can cook so much in it, from curries and casseroles, soups and stews, to a whole chicken!!
      There is currently a Europe-wide supply issue with them, but we’ve been told that they should be back in stock by end of Feb 2018.
      You could always ask in the FB group for opinions by posting a question there. 🙂

  2. Fabulous recipe – as good as the unhealthy version I used to make from a French recipe when I had a spare 8 hours floating about pre-child and pre-SW. Tastes better than I thought it would bearing in mind it is an extra easy SP recipe! Thank you PON. PS I Made this on the hob as waiting for the Instant Pot European stock shortage to end.

  3. Hi
    I love French onion soup, but don’t have a sauté pot. Do you think it could be done in a soup maker?
    Thanks ☺️

    1. Hi Jade
      You can make this in a saucepan on the hob, or some group members have told us that they’ve used a soup maker. 🙂

    1. Hi Shell
      Stock pots are a jellified stock rather than a dry stock cube. You can find them with the stock cubes, gravy granules etc.
      If you don’t have any, a stock cube will be fine.

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