Another 5:2 Diet Fast Day – Another Soup Recipe

Celeriac and Sweet Potato Soup – a 5:2 Diet recipe:

You know, I keep promising I won’t make more 5:2 diet recipe soups.  And then, I try to work out what I want to eat on my 5:2 diet fast days – and I keep coming back to soup.  Luckily there are an infinite number of variations on the theme.  This time, I was simply using up vegetables that were lurking in the fridge.  A sweet potato and a piece of celeriac that had been marked down to 30p!

Sweet potato and celeriac soup

It’s a very simple soup – and I was suprised at how tasty and rich it was.  The combination of sweet potato and celeriac makes a naturally thick and creamy soup without the addition of any milk or cream.  It’s lovely just as it is, or with a spoon of creme fraiche.  But for a change, and because I had a slice of pancetta left over in the fridge, I garnished the finished dish with a bit of crumbled crispy pancetta.  You could use bacon instead.  Or, if you want to keep the dish vegggie, then a garnish of some crisp croutons or a little caramelised onion would be perfect.

Sweet Potato and Celeriac Soup with Pancetta

Serves 2
Prep time 5 minutes
Cook time 25 minutes
Total time 30 minutes
Dietary Vegan, Vegetarian
Meal type Soup
Misc Freezable, Pre-preparable, Serve Hot


  • 100g Sweet Potato (peeled and cubed)
  • 200g Celeriac (peeled and cubed)
  • 600ml Vegetable stock (I used Knorr touch of taste)
  • 1 thin slice Pancetta (grilled or dry fried till crispy)
  • Salt and pepper to taste


Step 1 Boil the cubes of celeriac and sweet potato in lightly salted water till tender
Step 2 Drain and mash roughly
Step 3 Stir through the vegetable stock (nb. use the water from boiling the vegetables for extra flavour)
Step 4 Zap with a hand blender and simmer gently for 5 minutes. Taste and add salt and pepper as required
Step 5 Serve garnished with the pancetta crisps - or with croutons for a vegetarian option

This soup without garnish is around 85 calories per serving.  Obviously the final calorie count will depend on what you use but half a slice of dry fried pancetta will be around 20 calories.  And, it adds just a little protein to the dish, helping to make it keep you feeling full for longer.

Sweet Potato and Celeriac Soup with Pancetta

So, a perfect 5:2 diet fast day lunch.


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  1. says

    I have always been a bit sceptical about cooking celeriac. I really cannot tolerate the flavour of celery. Is it similar in flavour? But your soup looks really tempting.

    • says

      to be honest, for me yes it does have a mild celery taste. It isn’t as strong though. I’ve made sweet potato and carrot soup in the past though, you might want to try that…

  2. Pamela Morse says

    I would not have thought of this combo..I do regular potato with celery root, but this sounds like a richer version…mmmm.

  3. says

    Loving the cheeky pancetta addition!. Celeriac is such a wonder veg (as is sweet potato). Packed full of the good stuff but very few cals. Great for 5:2 I’d imagine.


    Oooh another soup I have got to try! Have never tried celeriac before – I actually ummed and ahhed over it the other day because someone suggested celeriac mash. Will have to definitely try this though as I love sweet potato. xoxo

    • says

      celeriac mash only really works if you like the taste of celery…it DOES have a mild celery flavour. I rather like it with the right ‘partner’ – white fish or chicken for instance…

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