Roasted butternut squash and sage soup brings together sweet, browned squash and the savoury fragrance of fresh herbs. Roasting the squash before it goes into the saucepan gives the soup a deeper flavour than simmering everything together from the start. The flesh blends into a smooth, substantial soup without needing cream, while a small splash of lemon juice keeps the finished bowl from tasting overly sweet.
This recipe keeps the seasoning simple so that the squash and sage remain recognisable. You will roast the squash in chunks, soften an onion separately, then bring everything together with vegetable stock. Save a few browned squash pieces for the top if you like a little texture. Serve it for lunch with toast, or make it the first course of a relaxed supper.
Roasted butternut squash and sage soup
Serves: 4. Preparation: about 20 minutes. Cooking: about 50 minutes, with some of the saucepan work happening while the squash roasts. You will need a large roasting tray, a large saucepan and a stick blender or jug blender.
Ingredients
- 1 large butternut squash, about 1.3kg whole, giving roughly 900g peeled and deseeded flesh
- 2 tablespoons olive oil, divided
- 1 large onion, finely chopped
- 2 garlic cloves, finely chopped
- 8 fresh sage leaves, finely sliced
- 900ml vegetable stock, plus up to 200ml extra to adjust the consistency
- 1 teaspoon lemon juice, plus more to taste
- Salt and freshly ground black pepper, to taste
- 4 tablespoons plain yoghurt, optional, to serve
Choose a vegetable stock whose flavour you enjoy, since it becomes part of the finished soup. If it is already well seasoned, wait until after blending before adding salt. Fresh sage gives a rounded, fragrant result; if you only have dried sage, use half a teaspoon and add it with the garlic.
Method
- Prepare the squash. Heat the oven to 220°C, or 200°C fan. Trim the squash, peel it and cut it in half lengthways. Scoop out the seeds and stringy centre, then cut the flesh into roughly 3cm chunks. Use a stable chopping board and work with flat cut surfaces against the board wherever possible.
- Roast until tender and browned. Put the squash on a large roasting tray with 1 tablespoon of the olive oil and a little black pepper. Toss well and spread into a single layer. Roast for 35–45 minutes, turning once, until a knife slides easily into the flesh and some edges are golden brown. Use two trays if the pieces would otherwise be piled together.
- Soften the onion. While the squash cooks, warm the remaining tablespoon of oil in a large saucepan over a medium-low heat. Add the onion and cook for 10–12 minutes, stirring regularly, until soft. If it starts catching, lower the heat and add a splash of water. You want a softened onion without dark, bitter edges.
- Add the aromatics. Stir the garlic and sliced sage into the onion. Cook for 1–2 minutes, stirring, until fragrant. Keep the heat gentle so the garlic does not burn. Have the stock ready before you begin this step, so you can add it promptly once the garlic and sage have cooked.
- Bring the soup together. Add the roasted squash to the saucepan, reserving a few pieces for topping if you wish. Pour a little of the measured stock onto the roasting tray and loosen any browned juices with a wooden spoon. Add these to the pan with the rest of the 900ml stock. Bring to a gentle simmer and cook for 10 minutes.
- Blend carefully. Take the pan off the heat. Blend with a stick blender, keeping its head submerged to prevent splashes, until smooth. If using a jug blender, allow the soup to cool sufficiently for your appliance and follow its instructions for hot liquids. Work in small batches and never seal hot soup into a blender that is not designed for it.
- Adjust and serve. Return the soup to a low heat. Add extra stock a little at a time if it is thicker than you prefer. Stir in the lemon juice, taste, then adjust the salt, pepper and lemon as needed. Ladle into bowls and finish with any reserved squash and a spoonful of yoghurt.
Getting the roast flavour right
The roasting tray does much of the flavour-building here. Leave a little space around the squash pieces so that moisture can escape. A crowded tray traps steam, which softens the squash but gives you fewer browned edges. Check underneath a piece before turning: if it has taken on colour and releases easily, it is ready to move.
Squash varies in moisture and sweetness, so use the cooking time as a guide rather than a deadline. Pale, firm pieces need longer; deeply coloured edges with tender centres are ready. Avoid letting the corners become black, as that bitterness will carry through once everything is blended.
Balancing sweetness, sage and texture
Sage has a distinctive flavour, and a little restraint helps it sit alongside the squash. Start with the measured leaves rather than adding a large handful. Cooking them briefly with the onion distributes their flavour through the soup. Adding lots of raw chopped sage at the end can make the bowl taste harsh.
For the texture, start with the smaller amount of stock and make adjustments after blending. It is easy to loosen a thick soup, whereas reducing a thin one takes more time. The lemon should brighten the flavour without making the soup noticeably sour, so add any extra in small amounts and taste between additions.
Serving ideas and simple variations
A slice of wholemeal toast is a straightforward partner. For a more substantial lunch, add a cheese toastie or serve hummus and bread alongside. Keep toppings modest so that each spoonful still tastes of roasted squash and sage.
- Add crunch: scatter a spoonful of toasted pumpkin seeds over each bowl just before eating.
- Keep it dairy-free: leave out the yoghurt or use an unsweetened dairy-free alternative.
- Make it more savoury: finish with a little grated mature Cheddar instead of yoghurt.
- Try rosemary: replace the sage with 1 teaspoon finely chopped fresh rosemary, cooking it with the garlic.
Cooling, storing and reheating
Divide leftover soup into shallow containers so it cools promptly, then refrigerate within two hours. Eat refrigerated soup within 48 hours, or freeze it in individual portions for up to three months. Leave a little space in freezer containers for expansion and label them with the contents and date.
Defrost frozen soup in the fridge before reheating. Warm it in a saucepan, stirring frequently, until steaming hot throughout, and reheat only once. It will often thicken during storage; stir in a little water or stock to restore the consistency. Add yoghurt and other toppings after reheating so they stay fresh and distinct.
