Roast Pumpkin Sweet Potato Soup

Ingredients

• 454 gPumpkin, cut into 10 cm cubes
• 454 gSweet potato, halved lengthways
• 240 ml (1 cup)Onion, roughly sliced
• 3 clovesGarlic, skin on
• 15 ml (1 tbsp)Olive oil, for drizzling over the vegetables
• 28 g (2 tbsp)Butter
• 480 ml (2 cups)Stock, vegetable or chicken
• 3Bay leaves
• 480 ml (2 cups)Milk, half-and-half or cream
• 2.5 ml (½ tsp)Salt
• 2.5 ml (½ tsp)Pepper

Instructions

1. 1

   Roast the vegetables

   Heat the oven to 165°C (325°F/Gas Mark 3). Line a baking tray with foil or baking parchment, and lightly spray it with oil to prevent sticking.

2. 2

   Prepare the vegetables

   Wash and halve the sweet potato lengthways. Peel the pumpkin and cut it into large chunks. Slice the onion and leave the garlic cloves in their skins. Take care when cutting these firm vegetables.

3. 3

   Season and arrange

   Put the pumpkin, sweet potato, onion and garlic on the tray. Drizzle with the olive oil and season with salt and pepper, keeping the vegetables spread out; use two medium trays if needed.

4. 4

   Roast until tender

   Roast for 40–60 minutes, until the vegetables are soft and the edges are slightly caramelised. The onion and garlic should be soft and more deeply coloured.

5. 5

   Cool and peel

   Leave the vegetables to cool for 10 minutes. Peel the sweet potato and remove the garlic pulp by squeezing it from the softened skins.

6. 6

   Add stock and butter

   Transfer the roasted vegetables to a soup pot with the butter, bay leaves and stock. The vegetables have already been roasted, so they do not need to be sautéed.

7. 7

   Bring to a boil

   Set the pot over a medium heat and cook for 5–7 minutes, until the mixture comes to a boil. It will be thick and chunky at this point.

8. 8

   Blend until smooth

   Remove the bay leaves, then blend the soup with a hand blender until smooth. If using a stand blender, let the soup cool briefly and take care when blending hot liquid.

9. 9

   Add the milk

   Stir in the milk, half-and-half or cream, then adjust the seasoning with salt and pepper. Add water if needed to reach your preferred consistency; if using milk, avoid overheating it.

10. 10

    Serve the soup

    Take the pot off the heat and serve the soup in bowls with toasted croutons or bread. Finish with a drizzle of cream or a dab of butter, and loosen with a little hot water if it has thickened as it cooled.

What is roast pumpkin sweet potato soup?

This is a smooth vegetable soup built around pumpkin and sweet potato, with onion and garlic for savoury depth. Roasting the vegetables before simmering them gives the soup its characteristic sweetness and a soft, rounded flavour.

Pumpkin soups are popular in American home cooking, especially in autumn, though the ingredients work well whenever pumpkin is available. Here, sweet potato adds body, while stock and milk or cream bring the roasted vegetables together.

Nutrition and macros by portion

The nutrition label shows one serving as written: 439 calories, 21g protein, 22g carbs, 33g fat.

The pumpkin and sweet potato provide most of the carbohydrates, while the butter, olive oil and chosen dairy contribute much of the fat. The stock and dairy provide some protein, with the exact balance depending on whether you use milk, half-and-half or cream. Serve with a generous portion of vegetables or salad alongside for a more balanced plate.

Roast for deeper flavour

Pumpkin and sweet potato: cut them into substantial pieces so they soften without drying out too quickly. Spread them in a single layer to encourage browning rather than steaming.

Onion and garlic: keep the garlic in its skin during roasting, which protects it as it softens. The onion and garlic should become tender and caramelised around the edges.

Blend safely and smoothly

Cool first: let the roasted vegetables rest for 10 minutes before handling them. Scoop the soft garlic from its skin and peel the sweet potato once it is comfortable to handle.

Blend carefully: take out the bay leaves before blending. A hand blender can be used directly in the pot; for a stand blender, cool the soup a little and blend in batches if necessary to avoid splashes.

Get the consistency right

Before adding dairy: the vegetables, stock and butter form a thick mixture, so do not worry if it looks chunky before blending. Blend until no large pieces remain.

After adding dairy: stir in the milk or cream and judge the thickness once it is warm. The soup thickens as it cools, so thin it with a little hot water before serving if needed.

Choose the dairy finish

Milk: gives the soup a lighter, less rich finish. Warm it gently after blending and avoid boiling the soup once it has been added.

Half-and-half or cream: makes the soup richer and silkier. Add either gradually and stir well so it blends evenly into the hot soup.

Plan the timing

The oven does most of the work, with 40–60 minutes needed to roast the vegetables. Start checking for tenderness at the shorter end of that range, as the size of the pieces and the tray arrangement affect how quickly they cook.

Once roasted, the soup comes together quickly on the hob. You can prepare the vegetables ahead, then blend and add the dairy close to serving.

What to serve alongside

Toasted croutons or bread add a crisp, sturdy contrast to the smooth soup. A simple green salad also works if you want a fresher side.

For extra richness, finish each bowl with a little cream or butter, as suggested in the method. Add the topping just before serving so it stays distinct.

Recipe notes & tips

• Use two trays if the vegetables would otherwise overlap.
• Cut the pumpkin and sweet potato into pieces of similar size so they roast at a similar pace.
• Check tenderness with a knife before removing the vegetables from the oven.
• Squeeze the roasted garlic pulp from its skin rather than trying to peel it.
• Remove every bay leaf before blending.
• Add hot water a little at a time when thinning the soup.

Variations

• Use vegetable stock: choose it for a meat-free version.
• Use chicken stock: swap in chicken stock for a savoury variation.
• Make it creamier: use cream instead of milk for a richer finish.
• Add a topping: scatter toasted croutons over each bowl for crunch.
• Serve with bread: offer warm bread alongside for dipping.

Common mistakes to avoid

• Crowding the tray: the vegetables can steam instead of browning; divide them between two trays.
• Cutting uneven pieces: they may roast at different speeds; aim for similarly sized chunks.
• Blending with bay leaves: remove all three before blending so they are not left in the soup.
• Blending very hot soup in a stand blender: it can splash; let it cool briefly and blend cautiously.
• Boiling after adding milk: the dairy may split; heat gently and avoid bringing it back to a boil.
• Adding too much water at once: the soup can become thin; add it gradually and check the consistency.

How to store

Cool leftovers promptly and store them in an airtight container in the fridge for up to 3 days. Reheat gently in a saucepan, stirring often and avoiding a boil, especially if the soup was made with milk; add a splash of water if it has thickened.

Frequently asked questions