Soups & Stews
This velvety leek and potato soup recipe delivers the hearty, comforting flavors UK kitchens love—creamy without cream, rich with thyme, and perfect for chilly evenings. The secret lies in slow-sautéed leeks and Maris Piper potatoes, simmered until tender and blended to a silky texture that coats every spoonful.
I developed this version after years of testing, ensuring it's foolproof for home cooks while staying true to traditional British comfort food.
The beauty of this one-pot wonder is its simplicity: just a handful of ingredients working together to create a soup that's both nourishing and deeply satisfying. We'll start with gently caramelized leeks—sweated in butter until soft and sweet—before adding potatoes and stock to build a flavorful base.
A splash of cream at the end (optional) adds luxurious depth, but the soup shines on its own with just thyme and a touch of black pepper. The result? A velvety, golden broth that's perfect for ladling into bowls with crusty bread or a sprinkle of fresh herbs.
What makes this recipe truly special is its adaptability—thicken it with a cornstarch slurry for a rustic texture or leave it light for a more modern twist. The thyme-infused flavor develops as it simmers, creating layers of aromatic warmth that make every spoonful feel like a hug.
Whether you're feeding a family or prepping for a cozy night in, this soup delivers restaurant-quality comfort without the fuss.
For those who love leftovers, this soup only gets better with time as flavors meld—ideal for meal prepping or freezing. Pair it with a simple green salad or warm soda bread to round out the meal.
Here’s how to make it, step by step, for a bowl of pure, velvety goodness that tastes like home.
Ingredients for best leek and potato soup recipe uk
Just seven core ingredients transform into velvety British comfort—no fancy techniques, just slow simmered perfection.
| Ingredient | Amount | Notes |
|---|---|---|
| Leeks 🧅 | 2 large | White and light green parts only |
| Maris Piper Potatoes 🥔 | 2 lb | Peeled and cubed evenly |
| Unsalted Butter 🧈 | 4 tbsp | European-style preferred |
| Fresh Thyme 🌿 | ½ ounce | Leaves only, stems removed |
| Vegetable Stock 💧 | 4 cups | Homemade or quality store-bought |
| Heavy Cream 🥛 | ¼ cup | Optional for finishing |
| Black Peppercorns 🌶️ | ½ tsp | Freshly cracked preferred |
| Sea Salt 🧂 | 1 tsp | Diamond Crystal preferred |
| Cornstarch 🌾 | 1 tbsp | For optional thickening |
| Fresh Chives 🌱 | 2 tbsp | Chopped for garnish |
| Soda Bread 🍞 | 1 loaf | For serving |
| Olive Oil 🫒 | 2 tbsp | For sautéing leeks |
The Maris Piper potatoes are non-negotiable here—they're the fluffy, buttery stars of this soup. Grab a 2lb bag from Waitrose or Tesco for that classic British flavor. If you can't find them, Yukon Golds work in a pinch. The leeks? Two large with clean white parts only—no need to peel the green bits. I always buy them fresh from the market (they keep for 1 week in the crisper) or grab the pre-sliced kind at M&S when I'm lazy. The thyme? Fresh bundles from the grocery store's herb section—dried works but lacks that aromatic punch.
No heavy cream? Coconut cream gives a similar richness, though it'll taste slightly different. Short on thyme? Dried thyme at one-third the amount gets you close, but fresh is worth the extra penny. The vegetable stock can be store-bought (I like Kallo or Pepperpot for depth), but homemade is always better. For the optional thickening, cornstarch slurry (1 tbsp cornstarch + 1 tbsp cold water) is your best bet—it blends right in. The chives? Fresh from the garden if you've got them, but the dried kind in jars works too. Just don't skip the finishing sprinkle—it adds that restaurant-quality touch.
This soup tastes even better the next day, so double the batch if you're feeding a crowd. Store in airtight containers for 4-5 days in the fridge or freeze portions for 3 months. I always make a big pot on Sundays—it reheats beautifully and turns into quick lunches all week. For serving, warm soda bread is traditional, but crusty baguettes work too. The leftovers? Even more delicious with a swirl of cream stirred in later—trust me on that.
Why You'll Love This Recipe
- Minimal Chopping Required: The Maris Pipers stay whole—just peel and drop. Leeks? I slice the white and pale green parts only, no fancy dicing. That’s it. Honestly, I’ve made this on days when I couldn’t be bothered to wash my hands properly.
- Creamy Without the Custard: Unsalted butter and vegetable stock build depth, but it’s the thyme that makes it sing. The Maris Pipers soften into fluffy clouds, while the leeks add a subtle sharpness—like a hug in a bowl. (Yes, even on a Tuesday night.)
- Leftovers That Taste Better: This soup actually improves the next day. The flavors meld, the potatoes get even creamier, and I’ve reheated portions straight from the fridge for a proper wintery lunch. No sad, watery leftovers here.
- Budget-Friendly Luxury: Maris Pipers are cheap in bulk, and leeks keep for ages in the crisper. A stick of butter and a sprig of thyme stretch this into four hearty servings. I’ll be real: it’s the kind of dish that makes store-brand stock feel like a splurge.
Step-by-step instructions for velvety thyme-infused leek and potato soup
This method delivers restaurant-quality soup with rich layers of flavor and velvety texture—every spoonful is pure comfort.
Sauté Leeks Until Translucent
Heat the 2 tablespoons olive oil in a large pot over medium heat. Cut the 2 large leeks lengthwise and slice into ¼-inch rounds, discarding the dark green parts. Add the leeks to the pot and cook, stirring occasionally, for 8-10 minutes until completely softened and translucent.
This slow cooking process removes the natural bitterness from the leeks, ensuring a sweet, mellow flavor in your soup. If the leeks start to brown too quickly, reduce the heat slightly—you want them tender but not crispy. Keep them moving in the pot to prevent sticking.
Build the Flavor Base with Potatoes and Thyme
Add the 2 lb Maris Piper potatoes, cut into 1-inch cubes, to the pot along with 2 tablespoons unsalted butter and the 0.5 ounce fresh thyme leaves. Stir to coat the potatoes evenly in the butter and leek mixture. Pour in the 4 cups vegetable stock and bring to a gentle boil over medium-high heat. Once boiling, reduce the heat to low and let it simmer for 20-25 minutes until the potatoes are fork-tender.
The thyme leaves will infuse the soup with their earthy aroma, while the butter adds richness that balances the leeks' natural sweetness. Taste the broth after 15 minutes—if it needs more depth, add a pinch of sea salt or a crack of black peppercorns now. The potatoes should collapse easily when pierced with a fork at the end of this time.
Blend to Silky Perfection
Using an immersion blender, carefully blend the soup directly in the pot until completely smooth. For a smoother texture, work in batches if needed, or transfer the soup to a countertop blender (be cautious with hot liquids). Return the blended soup to the pot and stir in the 0.25 cup heavy cream over low heat for 3-4 minutes until warmed through.
This blending step transforms the soup from rustic to luxurious. The cream adds a velvety finish, but if you prefer a lighter version, omit it entirely—the soup will still be rich from the butter and stock. Taste again and adjust seasoning—this is where the soup truly comes together, so don't rush it.
Thicken and Finish with Fresh Herbs
In a small bowl, whisk together the 1 tablespoon cornstarch with 2 tablespoons cold water to create a slurry. Slowly pour the slurry into the simmering soup while stirring constantly for 2-3 minutes until the soup thickens to your desired consistency. Remove from heat and stir in the 2 tablespoons chopped fresh chives just before serving.
The cornstarch slurry gives the soup a luxurious body without overpowering the natural flavors. The chives add a bright, fresh finish that cuts through the richness. Serve immediately with warm soda bread on the side—each bite of crusty bread will soak up every last drop of this velvety soup.
Rest and Serve for Maximum Comfort
Let the soup rest for 5 minutes before serving to allow the flavors to meld. Ladle into bowls and garnish with an extra sprinkle of chives and a crack of black peppercorns. The contrast of the warm, creamy soup with the slightly tangy soda bread makes this dish pure comfort food.
This soup tastes even better the next day as the flavors deepen. Store leftovers in the refrigerator for up to 3 days or freeze for 3 months. The velvety texture and aromatic thyme make this a perfect dish for chilly evenings—simple yet undeniably special.
Pro Tips For Making Best Leek And Potato Soup Recipe Uk
- CHAR THE LEEKS FIRST: I learned this the hard way—raw leeks taste bitter and never soften properly. Sweat them in 2 tablespoons of unsalted butter over medium-low heat for 10 minutes, stirring often, until they’re translucent and smell sweet. (Yes, even if you’re impatient like me, don’t rush this.)
- CUT POTATOES EVENLY: Maris Pipers fall apart if they’re uneven—aim for 2cm chunks so they cook at the same rate. Skip the peeler; scrub them well and leave the skin on for texture. (Your future self will thank you when the soup isn’t mushy in some spots and crunchy in others.)
- SALT THE STOCK LATE: Add the vegetable stock after the potatoes have simmered for 15 minutes, not at the start. This prevents the potatoes from absorbing too much liquid early and turning gluey. (I used to ignore this, and the soup always ended up watery.)
- FINISH WITH THYME SPRIGS: Toss in 2-3 fresh thyme sprigs with the butter at the end, then let them steep for 2 minutes off the heat. The leaves infuse the soup better than chopped stems, and you can fish them out easily. (Sounds weird, but it works—trust me.)
Pro cooking tips for this dish
Leek Mastery
Leeks are the soul of this soup, so handle them with care. Start by slicing them lengthwise and rinsing thoroughly under cold water to remove any grit trapped between the layers. I swear by the ¼-inch round slices—this size ensures they soften evenly without turning mushy.
Sauté them in olive oil over medium heat for 8-10 minutes until translucent, stirring occasionally. If they start to brown too quickly, reduce the heat slightly—they should be tender but not crispy. 🧅
Potato Perfection
The secret to fluffy potatoes lies in even cutting and proper cooking time. Cube the Maris Piper potatoes into 1-inch pieces—this size ensures they cook through without turning to mush.
Add them to the pot with the leeks, along with 2 tablespoons butter and 0.5 ounce fresh thyme, then pour in the 4 cups vegetable stock. Simmer for 20-25 minutes on low heat until fork-tender.
Taste the broth halfway through—if it needs more depth, add a pinch of sea salt or a crack of black peppercorns. The potatoes should collapse easily when pierced with a fork.
Blending Like a Pro
An immersion blender is your best friend here—it keeps everything in one pot and makes cleanup a breeze. Blend the soup until completely smooth, working in batches if needed. For a silky texture, avoid over-blending, which can make the soup gummy.
If you prefer a chunkier texture, blend only until the potatoes are broken down. Return the soup to the pot and stir in the 0.25 cup heavy cream over low heat for 3-4 minutes to warm it through.
This step adds a luxurious finish, but if you want a lighter version, skip the cream entirely.
Thickening Tricks
For a thicker, more restaurant-style soup, whisk 1 tablespoon cornstarch with 2 tablespoons cold water to create a slurry. Slowly pour it into the simmering soup while stirring constantly for 2-3 minutes. This method ensures a smooth, velvety consistency without lumps.
Taste and adjust the seasoning—this is where the soup truly comes together. The cornstarch slurry adds body without overpowering the natural flavors of the leeks, potatoes, and thyme.
Fresh Herb Finish
Finish your soup with a sprinkle of chopped fresh chives just before serving. This adds a bright, fresh contrast to the rich, creamy soup. I also like to garnish with a crack of black peppercorns for a little extra kick.
Let the soup rest for 5 minutes before serving to allow the flavors to meld. Serve it with warm soda bread on the side—each bite of crusty bread will soak up every last drop of this velvety soup. 💫
Leftovers Love
This soup tastes even better the next day as the flavors deepen. Store leftovers in airtight containers in the refrigerator for up to 3 days or freeze for 3 months. When reheating, add a splash of water or stock to prevent it from getting too thick.
The velvety texture and aromatic thyme make this a perfect dish for chilly evenings—simple yet undeniably special. Trust me, your freezer will thank you later! ❄️
Nutrition facts
Frequently asked questions
What makes Maris Piper potatoes better than other varieties for this soup?
Maris Piper potatoes are the UK's gold standard for creamy soups because they're naturally buttery and fluffy when cooked. Their high starch content breaks down beautifully during blending, creating that signature velvety texture. While Yukon Golds work in a pinch, Maris Pipers deliver that authentic British comfort food experience you can't get with other varieties.
Can I make this soup without an immersion blender?
Transfer the hot soup to a countertop blender in batches (never fill it past the max line), blending each batch until completely smooth. Just be extra careful with the hot liquid—always let steam escape first and never overfill. For a rustic texture, you could also mash the potatoes separately before adding them to the broth.
How can I make this soup dairy-free? Skip the butter and cream completely, and use olive oil for sautéing. For richness, stir in ¼ cup coconut cream at the end or add 1 tablespoon nutritional yeast for a cheesy flavor. The soup will still be delicious—just with a slightly lighter texture.
Why does my soup taste bland after blending?
Blending can sometimes dilute flavors, so taste as you go! Boost depth by adding 1 extra tablespoon butter while blending or a pinch of sea salt and black pepper to the finished soup. For extra umami, stir in 1 teaspoon soy sauce or a splash of Worcestershire sauce—both work beautifully in this dish. The key is seasoning in layers throughout the cooking process.
What's the best way to reheat leftover soup?
Gently reheat on the stove over low heat with a splash of water or stock to prevent thickening. For microwave reheating, cover with a damp paper towel and heat in 30-second bursts, stirring between each. If the soup seems too thick after reheating, thin it with a little more stock or water. Never boil leftover soup—this can make it gummy and break down the velvety texture.