Syn Free Liver with Onion Gravy | Slimming World

This Syn Free Liver with Onion Gravy recipe is so quick and easy. You can have it prepared and cooked in under 30 minutes! If you’re not keen on Liver, you should try our Meatballs & Syn Free Gravy.

Syn Free-Liver-with-Onion-Gravy

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 👍

Syn Free Liver with Onion Gravy is a traditional British dish, that has been around since the 19th century, and has even been served as breakfast. I’m not sure I’d have it first thing in a morning, but for diner it is delicious!  Liver is really healthy because it contains vitamins A, B and C, as well as other vitamins and minerals.

Syn Free-Liver-with-Onion-Gravy

Not everyone in our house is a fan of liver, so I usually brown some sausages under the grill and add them to the gravy. Personally I love liver, but Kay detests it!

To make sure the Liver is cooked enough, check to see whether there is pink liquid coming out of it and if it is soft all the way through when pierced with a sharp knife. The texture should be similar to firm pate. Overcook the liver and it’ll be as dry as old boots, so be careful.

Undercooked or overcooked liver is as bad as any other meat cooked incorrectly but making it the right way results in a nutritious and mouthwatering meal coming in at under 300kcal’s per serving.

Syn Free-Liver-with-Onion-Gravy

In my opinion the gravy doesn’t need thickening, but if you want it thicker you can add a couple of teaspoons of Corn Flour or a tiny bit of Xanthan Gum. If you do chose to have it thicker, don’t forget to add the syns!

Liver is ridiculously cheap, which means you can make this Syn Free Liver with Onion Gravy for less than £1 per serving. Fantastic if you’re on a budget.

Syn Free-Liver-with-Onion-Gravy


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! The Sunflower or Olive Oil flavours are ideal for this Syn Free Liver with Onion Gravy recipe.

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Syn Free Liver with Onion Gravy | Slimming World

Votes: 6
Rating: 5
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Prep Time

Cooking Time

portion 5 minutes 15 minutes



Slimming World 

247kcal 5

Smart Points (Flex/Freestyle)



Per portion Per portion Per portion
Suitable For Freezing icon Dairy Free icon
Please Note - If portions are changed, then points/values will not change and will need to be worked out by yourself. We're working on this!
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  1. Spray a decent size frying pan with some Frylight and place on a high heat
  2. Peel the onions. Chop one of them roughly and cut the other one into slices. Peel and chop the carrot
  3. Season the liver with a little sea salt and freshly ground black pepper. Carefully put the liver in the hot pan and cook for 2 - 3 minutes. Turn each piece and cook for another 2 or 3 minutes
  4. Remove the liver from the pan and set aside. Spray the pan with some more Frylight. Cook the onion slices until they start to soften and colour. Remove them from the pan and set aside with the liver
  5. Add the carrots, chopped onion and stock to the pan. Bring to the boil and simmer for 10 minutes. When the onions and carrot are cooked blitz them with a stick blender until smooth. The gravy may be a little orange due to the carrot, so add a couple of drops of gravy browning if you want
  6. Put the liver and cooked onions back into the gravy and cook for another few minutes. Check the liver is cooked to your liking and serve

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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.


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 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 be responsible for any loss or damage resulting for your reliance on nutritional information.

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    1. Hi Ryan
      Gravy browning is a liquid used to give a deeper colour to gravies and stews. You should find it with a gravy granules and stock cubes in most large supermarkets. The one I’ve seen most frequently is the Sarsons brand, in a dark green bottle.

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Slimming World Recipes
A blog started by 2 chefs on their Slimming World journey, evolving into an epic adventure shared by many!