Next level caramalized onions

Easy, fast (30mins), no added sugar.

Almost every great meal begins with onions… don´t you agree! I wish I could remember where I first saw this recipe – perhaps on the Joule App I got with my sous vide machine ( even though this isn´t a sous vide recipe, it´s great with sous-vide steak !) In fact I´m sure you could make these sous-vide, but they wouldn´t caramelize that way I think – but they would save you standing over them stirring for 20mins !

Last updated Oct 27, 2021 at 7:09PM | Published on Oct 24, 2021

Affiliate Disclosure: As an Amazon Associate I earn from qualifying purchases.  Some of the links in this post are affiliate links and if you go through them and make a qualifying purchase I may earn a commission, at no extra cost to you.

easy caramalised onions recipe

I first put this recipe on Instagram ( that´s why you can still see the arrows on the pix !) and the email newsletter, but now I´m re-writing it here so that I don´t ever lose it 🙂


finely sliced raw onion

Scroll down to see the images and you´ll got the process.( I just forgot to photograph the mandoline slicing the onions so finely.)

It looks like. mountain of much raw onion to make this little bowl full.

It’s a generous portion for 2 people with a burger or steak. But I could eat it on its own right out of the bowl.


wide mouth mason jars for hand blending in , sous vide cooking, canning, freezing etc


1. Onions are mostly water …70-80% so you can see in advance what you will end up with. Your cooked onions will end up about 1/4 the size of your raw onions.

2. Save your tears and use a Mandoline to slice your onions. It´s fast and precise. It makes light and perfect work of finely slicing these sweet yellow onions … and you want to be quick as they smell strong. The link below  in the TOOLS takes you to the one we use. We also love de Buyer ( and happen to have one of those too), or for much less- buy a  Milcea or Oxo branded one, so check those out when you click through.

3. Depending on the size of your thyme, pull it through a sieve or colander to take the leaves off- or buy one of those herb strippers- I have in on the ‘tools we like ‘ section of the blog.

my preserved lemons
my preserved lemons


  • 2 onions
  • 15ml butter
  • 15ml olive oil
  • 2g / handful of thyme
  • 10ml water
  • 10ml white wine vinegar
my preserved lemons


Now for the recipe … if I can do it so can you!


Step 1

Take one medium sweet onion per person- sliced v thinly (1-2mm) I used two onions. So the rest of the ingredients match that.

Step 2

Heat max. 15ml butter and 15ml olive oil in a heavy-based pan. When melted, add raw onions and stir in for a few mins high heat, then turn down to medium and keep watching and stirring for about 20mins till they’re nice and golden.

Step 3

Meanwhile grab some fresh thyme – a handful, about 2g for two people. De-stem if it’s old thyme and chop it finely. (I´ve also since made this recipe with dried thyme – it works well too.)

Step 4

Add 10ml water and 10ml white or rice vinegar to the chopped thyme plus a big pinch sea salt flakes and a little ground black pepper. Mix.

Step 5

Take the onions off the heat when ready- don’t delay in case they burn. Add the thyme /vinegar mix to the onions and stir in. You can see it getting nice and creamy as it emulsifies.

Step 6

SERVE immediately! 🥰 enjoy.

my preserved lemons

More onion recipes. 

red onion pickle with star anise

Pickled red onion

An unbelievably easy-to-make, pretty pickle. A great topping for burgers, salads, cheese… anything. Fabulous for pickled carrot snacks too. 

home-made burger and red onion marmalade

Red onion marmalade

Discover how simple it is to make it… when you have the right tool for the job!

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Thank-you to Tengyart from Russia for this sad to mad eggs image.

Eggs can be the most difficult things to cook well, and I feel this image represents all the emotions from cook to chef.

Makes us giggle.


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Affiliate disclosure

As an Amazon Associate I earn from qualifying purchases.  Some of the links in this post are affiliate links and if you go through them to make a purchase I may earn a commission.

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