Roast butternut and sweet potato soup

Tomorrow is publishing day for my new Ebook! I cannot wait to share what’s been happening in the kitchen for the past four months. In the meantime, here is one of my most loved roast butternut and sweet potato soup recipes that just missed making it into my first book. It’s easy, plant-based and completely delicious.

Butternut responds well to hardly herbs like rosemary and sage. There are times when dried herbs can do the work. This is not one of them. Fresh rosemary and sage guarantee vigorous flavour which’ll be sadly lacking if you do otherwise. There are two parts to this Italian inspired soup, starting in the oven and brought together on the stove. Roasting the vegetables and herbs together elicits all sorts of wonderful nutty aromas. A bit of over-charring is highly recommended. Those blackened edges add sticky toffee-like sweetness. The sage butter is optional, but who wouldn’t want buttery herb crisps with their supper?

Side note: For the sage butter, melt 3 tablespoons salted butter in a pan. Once foaming and nutty, add a generous handful of picked sage leaves and toss to coat. Season lightly with sea salt flakes and freshly ground black pepper.

Roast butternut and sweet potato soup


Roast Butternut and Sweet Soup

Serves 6-8

  • 45ml (3 tbls) olive oil
  • 15ml (1 tbls) butter
  • 2 orange sweet potatoes, peeled and chopped
  • 750g butternut chunks
  • 10 -12 sage leaves, finely chopped
  • 1 large sprig rosemary, destalked and finely chopped
  • ¼ teaspoon dried red chilli flakes
  • zest of half a lemon
  • 2 shallots, diced
  • ¼ teaspoon ground nutmeg
  • 800ml chicken stock
  • 1/2 cup freshly grated parmesan
  • 300ml milk
  • salt and black pepper, to taste
  1. Preheat the oven to 200 Celsius. Spread the butternut and sweet potato onto a baking sheet. Drizzle over 2 tablespoons olive oil and season with sage, rosemary, chilli, lemon zest, salt and pepper. Roast for 45-50 minutes until tender and the edges are tacky and scorched.
  2. Heat the remaining olive oil and butter in a saucepan and sauté the shallots until soft and caramelized, about 8-10 minutes. Scrape the roast vegetables into the pan. Add the nutmeg and the stock and simmer for about 8 minutes on a medium heat.
  3. Stir in the parmesan, then puree with an emersion blender. Add the milk and heat through. Serve with sage butter and toasted pumpkin seeds, if you like.



For more cozy soups to ward off the cold, here are some blog favourites:

Harira vegetable soup with barley and quinoa

Roast butternut soup with chickpeas and leeks

Roast sweet pepper soup with corn salsa

The Everything in Vegetable Soup






6 Comments. Leave new

  • Estelle Frankel
    16 July 2020 11:25 am

    Hi Dianne my family always tells me that Soup is not A Meal. What can one serve with soup ?

  • Dianne this looks amazing! And I have butternut and sweet potato in my pantry at the moment asking to be turned into a soup. One question – where do you get your parmesan cheese? I haven’t had all that much success with parmesan…

  • Dianne Bibby
    20 July 2020 10:00 am

    I always add some kind of crunchy toppings, like seeds or nuts, and then, some crusty bread. A good sourdough with grilled cheese is always a good idea.

  • Dianne Bibby
    22 July 2020 11:37 am

    Thanks Amy! I think these two veggie-draw staples are the bees knees. Game for just about anything. About the cheese – A good deli is probably the best bet. In Cape Town, Giovanni’s might have, although at the moment, it’s probably a struggle. Two year maturity is best. Failing that, Woolies Parmigiano Reggiano is the next stop. x

  • Thanks Dianne!

  • Dianne Bibby
    29 July 2020 11:10 am

    You’re welcome. Glad you like it!

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