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When the days are short and there’s a chill in the air across the Cotswolds, few things feel as restorative as a bowl of properly made leek and potato soup. It’s the kind of cooking that asks little of you but gives a great deal back — a pot of something thick, warming and deeply flavoured that fills the kitchen with a smell that makes everyone drift in from the other room.
Leeks are at their best from autumn through to early spring, and the ones grown across Wiltshire and Gloucestershire are a world away from the tired supermarket bundles that have been sat in a chiller for a week. When they’re fresh, the white stems are firm and bright, the flavour sweet and mild rather than sharp. Paired with floury potatoes — Maris Piper or King Edward work brilliantly here — you get a soup that’s naturally creamy without needing a drop of cream, though you’re very welcome to add some.
The Wiltshire Cheddar croutons are what take this from a good weeknight soup to something worth making on a Sunday afternoon. Cubes of bread tossed in a little oil and scattered with finely grated Cheddar, then roasted until golden and crisp — they add texture, richness and a proper savoury note that makes the whole bowl sing. This recipe is vegetarian, suits the freezer well (without the croutons), and comes together in well under an hour.
- 3 large leeks, trimmed, washed and sliced into 1cm rounds
- 600g floury potatoes (Maris Piper or King Edward), peeled and cut into rough 2cm chunks
- 1 medium onion, peeled and finely chopped
- 2 cloves of garlic, peeled and finely sliced
- 40g unsalted butter
- 1 tbsp olive oil
- 1.2 litres good vegetable stock (hot)
- 100ml double cream (optional, but recommended)
- Sea salt and freshly ground black pepper
- A small bunch of fresh chives, finely snipped, to serve
For the Wiltshire Cheddar Croutons
- 3 thick slices of good white bread or sourdough, cut into 2cm cubes
- 2 tbsp olive oil
- 60g Wiltshire Cheddar, finely grated
- A pinch of smoked paprika (optional)
- Preheat your oven to 200°C / 180°C fan / Gas 6. Toss the bread cubes with the olive oil and a pinch of salt on a baking tray, spreading them out in a single layer. Set aside while you start the soup.
- Melt the butter with the olive oil in a large heavy-bottomed saucepan over a medium-low heat. Add the onion and a pinch of salt and cook gently for 8–10 minutes, stirring occasionally, until softened and just starting to turn golden at the edges.
- Add the garlic and leeks and stir to combine. Continue cooking for another 8 minutes, stirring occasionally, until the leeks have wilted and turned soft and silky. Don’t rush this stage — the sweetness of the leeks develops with slow, gentle heat.
- Add the potato chunks and pour over the hot stock. Bring to a steady simmer, then reduce the heat, partially cover the pan and cook for 20–25 minutes until the potatoes are completely tender when pressed with the back of a spoon.
- While the soup simmers, place the bread tray in the oven. Roast for 8 minutes until the cubes are lightly golden and beginning to crisp. Remove from the oven, scatter over the grated Wiltshire Cheddar and the smoked paprika if using, then return to the oven for a further 4–5 minutes until the cheese is bubbling and the croutons are a deep golden colour. Keep warm.
- Once the potatoes are tender, remove the soup from the heat. Use a stick blender to blitz until smooth — or leave it slightly chunky if you prefer more texture. Stir in the double cream if using, then taste and adjust the seasoning with salt and black pepper.
- Ladle into warmed bowls, top each one with a generous handful of Cheddar croutons and a scatter of fresh chives. Serve immediately.
Why These Ingredients Work So Well Together
Leek and potato soup is a classic for a reason — the two vegetables have a natural affinity that goes back centuries in British cooking. Leeks bring a gentle, sweet onion flavour and a silky texture when cooked slowly, while floury potatoes dissolve into the stock and give the soup its characteristic body and creaminess. Together, they create something that feels substantial and comforting without ever being heavy.
The key to getting the best from this soup is starting with genuinely fresh, seasonal ingredients. Leeks harvested in autumn and winter from growers across Wiltshire and Gloucestershire have a sweetness and depth that you simply don’t get from produce that’s been in cold storage for weeks. Look for leeks with firm, tightly wrapped stems and bright green tops — the fresher they are, the sweeter and more flavourful the soup will be.
Wiltshire Cheddar is a natural partner here. Aged and savoury with a pleasant sharpness, it melts beautifully onto the croutons and creates a golden, cheesy crust that contrasts with the smooth soup beneath. If you can find a properly aged Wiltshire Cheddar from a local producer, it’s worth seeking out — the flavour is richer and more complex than most supermarket versions.
A note on potatoes
For the creamiest result, choose a floury variety such as Maris Piper or King Edward. Waxy potatoes like Charlotte or Nicola hold their shape too well and won’t break down into the stock in the same way, giving you a slightly grainy texture when blended. If you only have waxy potatoes to hand, the soup will still be good — just be sure to blend it very thoroughly.
Serving Suggestions
This soup is a complete meal in a bowl when served with the Cheddar croutons, but it also pairs very well with warm crusty bread for those who want something more substantial. A good sourdough or a seeded wholemeal loaf work particularly well alongside it.
Variations
To make the soup vegan, swap the butter for a good-quality olive oil or a plant-based alternative, replace the double cream with a splash of oat or cashew cream, and skip the cheese croutons in favour of simple herb-seasoned ones. The leek and potato base is naturally dairy-free and every bit as satisfying.
For a more substantial version, stir through some cooked smoked haddock or bacon lardons just before serving — both work beautifully with leek and potato, and the smokiness adds a pleasing depth. A handful of grated mature Cheddar stirred directly into the blended soup is another simple way to enrich it further.
This soup suits a wide range of occasions: a weeknight supper when you need something on the table quickly, a laid-back weekend lunch, or a starter for a dinner party served in smaller bowls without the croutons.
Storage and Reheating
The soup base keeps well in the fridge for up to 3 days in a sealed container. Reheat gently in a pan over a medium-low heat, stirring occasionally and adding a splash of stock or water if it has thickened too much. Do not boil once the cream has been added.
The soup also freezes very well — portion it into freezer bags or containers before adding the cream and freeze for up to 3 months. Defrost overnight in the fridge, then reheat gently and stir in the cream once hot.
The croutons are best made fresh, as they lose their crispness quickly once cooled. If you do have leftover croutons, spread them on a baking tray and refresh in a hot oven (200°C fan) for 4–5 minutes before serving.
Sourcing Fresh Leeks and Potatoes from Cotswold Foods
There’s a real difference between leeks and potatoes that have been sitting in a supermarket distribution centre for days and ones that have come straight from a grower local to you. Fresh leeks have a sweetness and a snap to them that wilted ones simply don’t — and it makes a noticeable difference in the finished soup. The same is true of potatoes: freshly harvested floury varieties have a natural earthiness and starch content that gives this soup its characteristic body.
At Cotswold Foods, we source our leeks and potatoes from growers across Wiltshire, Gloucestershire and the wider South West, prioritising British produce wherever possible and working with suppliers who share our approach to quality. If you’re in Bristol, Gloucestershire, South Gloucestershire or North Wiltshire, we can have fresh seasonal produce delivered to your door twice a week — on Tuesdays and Fridays. It’s the kind of thing that makes a genuine difference to what ends up in the pot.
Ready to Make This Recipe?
If this recipe has you reaching for your saucepan, head over to the Cotswold Foods shop and pick up everything you need — fresh leeks, potatoes and whatever else catches your eye this week. Choose your delivery day (Tuesday or Friday), and we’ll bring the freshest seasonal produce straight from local growers to your door. Good food starts with good ingredients, and we’re here to make sure you’ve always got them.
