Recipes - Pickles & Dips

Onion Relish (sugar free, fermented & prebiotic packed)

I’m sure you’ve heard all about probiotics – the beneficial bacteria that help keep our gut and digestion in top condition. Chances are you can name probiotic rich foods, like yoghurt, sauerkraut and kefir. Less well known, but equally as important, are prebiotics. Prebiotics are a non-digestable type of fibre found in certain foods. Simply explained they’re the food or fuel that allow probiotics to work their magic. Probiotics introduce desirable bacteria into our intestines and prebiotics ‘feed’ this good bacteria.

Diets rich in prebiotics have been linked not just to better digestion and gut health but also to lower inflammation and even strengthened immunity. There’s plenty of material online that explains all of this if you’re keen to know more. But right now you’re possibly wondering ‘So which foods are packed with prebiotics?’ You’ll be glad to here that plenty of common foods are rich in prebiotics. Like asparagus, Jerusalem artichokes, raw garlic, under ripe bananas and raw or cooked onions.

onion relish (sugar free)My personal top prebiotic pick has got to be onions – for their accessibility, affordability and versatility. Barely a day goes by when I don’t have at least one meal with onions involved. So when I came across a simple method for fermenting onions using only salt and vinegar I had to give it a go. The method that follows is sugar-free and requires only three staple ingredients. And because onion relish pairs well with all kinds of dishes this foolproof recipe gives you an easy way to get a prebiotic fix!

onion relish (sugar free)Fermented onion relish (sugar free)

To make around 800g of relish you’ll need 6-8 medium onions, 4tsp Himalayan salt and 4tbsp apple cider vinegar.

  • Peel and chop the onions into quarters (I used red onions but any onions should work well).
  • Spread the onion quarters in a baking dish, without overlapping them.
  • Cover the dish with foil and roast the onions for an hour in an oven that’s been pre-heated to 200C.
  • Allow the onions to cool slightly and finely chop them. Add the vinegar and salt and mix well.
  • Transfer the mixture into a sterilised jar.
  • Allow the relish to ferment in a dark spot at room temperature for around 24 hours.
  • Transfer the relish to the fridge where it will keep for a week or more.

That’s all there is to it – fermented, sugar free prebiotic packed onion relish!


onion relish (sugar free)

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40 thoughts on “Onion Relish (sugar free, fermented & prebiotic packed)

  1. Love this… it’s always in my fridge. I make a new batch every week! Only I use lemon juice… but will try with with apple cider vinegar soon!

  2. I made a jar of this immediately after our Instagram discussion and we’re still eating it 😊😊😊 I love it! I chopped my onions finer than yours but otherwise I did exactly as you said…and I’ll be making more very soon!
    Thank you for such a great recipe xx

  3. What a fantastic recipe, Laura. I love making relishes and I love onions. Like you I use them so much in cooking without even thinking about it. This looks so easy and tasty. Will have to try.

  4. I could imagine eating this delish and healthy onion pickle with all kinds of things, but what immediately springs to mind is cheddar! I would add this to a cheese board. Cheese and onion anything is always so good!

  5. Laura, I love onions on everything! I make the quickly pickled ones with Indian curries. I am definitely making these so I can have them handy in the refrigerator.
    Good information on the prebiotics too. Loved the post!

  6. Looks delish! I appreciate the quick and dirty low-down about prebiotics. I’ve been meaning to read more ever since they came on my radar but sometimes the problem is too much info!! 🙂

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  9. I have been eating sauerkraut almost daily and have been toying with the idea that I should make something fermented. This recipe is so incredibly easy. I will have to give it a go as it is truly versatile. Thank you!

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