Irish Soup: Creamy Potato and Leek Recipe

This Irish-style potato and leek soup is a smooth, savory bowl made with potatoes, leeks, onion, stock, and a little cream. It is served hot with bread or a simple garnish, and its mild flavor and straightforward method make it a practical meal for a chilly day.

Potato and leek soups appear in many regional and household versions, so this is one flexible Irish-inspired approach rather than a claim to a single definitive recipe. The potatoes give the soup body, while softened leeks add a gentle onion flavor; blending only after the vegetables are tender keeps the method simple and dependable.

Ingredients

2 tablespoons (28 g) unsalted butter
1 tablespoon (15 ml) olive oil
2 medium leeks, about 12 ounces (340 g) before trimming and roughly 8 ounces (225 g) cleaned and sliced
1 medium yellow onion, about 5 ounces (140 g), peeled and diced
2 garlic cloves, about 6 g, finely chopped
1 1/2 pounds (680 g) Yukon Gold or other waxy potatoes, peeled if desired and cut into 3/4-inch (2 cm) pieces
4 cups (950 ml) low-sodium vegetable or chicken stock
2 cups (475 ml) water
1 bay leaf, about 0.2 g
1 teaspoon (1 g) fresh thyme leaves, or 1/2 teaspoon (0.5 g) dried thyme
1 teaspoon (5 g) fine salt, plus more to taste
1/4 teaspoon (0.5 g) ground black pepper, plus more to taste
1/2 cup (120 ml) heavy cream, or whole milk for a lighter finish
2 tablespoons (8 g) chopped fresh chives or flat-leaf parsley, for serving
Optional: 1/8 teaspoon (about 0.3 g) freshly grated nutmeg

Instructions

Clean and prepare the leeks. Trim away the root ends and the tough dark-green tops, keeping the white and pale-green portions. Slice the leeks lengthwise, then cut them crosswise into thin half-moons. Rinse them thoroughly in a bowl of cold water, separating the layers so grit falls to the bottom. Lift the leeks out rather than pouring the water through them, then drain well. Dice the onion, chop the garlic, and cut the potatoes into evenly sized pieces so they cook at the same rate.
Soften the aromatics. Set a large, heavy-bottomed pot over medium heat. Add the butter and olive oil. When the butter has melted, stir in the leeks and onion with the salt. Cook for 7 to 8 minutes, stirring every minute or two, until they look soft and glossy but have not browned. If they begin to stick or color, lower the heat and add a tablespoon of water. Stir in the garlic and thyme and cook for 30 seconds, just until fragrant.
Add the potatoes and liquid. Tip in the potato pieces and stir to coat them in the softened vegetables. Pour in the stock and water, then add the bay leaf and black pepper. The liquid should come close to covering the potatoes; if your pot is unusually wide and a few pieces sit above the surface, add a little more water. Bring the pot to a gentle boil, watching that it does not foam over.
Simmer until tender. Lower the heat so the soup bubbles gently, partially cover the pot, and simmer for 20 minutes. Stir once or twice, scraping the bottom of the pot to prevent sticking. The potatoes are ready when a fork or the tip of a small knife slides through a large piece without resistance. If they are still firm, continue simmering and check again after 3 minutes.
Remove the bay leaf and blend. Take the pot off the heat and fish out the bay leaf. For a fully smooth soup, use an immersion blender directly in the pot, keeping the blade submerged to avoid splashes. Blend in short bursts until smooth. If using a countertop blender, work in small batches, fill it no more than halfway, leave the lid’s center vent open, and cover that opening with a folded towel; hot liquid expands as it blends.
Finish with cream. Return the soup to low heat if needed. Stir in the cream and nutmeg, if using, and warm gently for about 3 minutes without letting the soup boil. Taste and adjust the salt and pepper. If it is thicker than you like, stir in hot water or stock a few tablespoons at a time. If it seems thin, let it warm uncovered for another few minutes, stirring often.
Choose the texture. For a rustic soup with some pieces left intact, mash a few potatoes against the side of the pot before blending, or blend only half the soup and stir it back in. Avoid prolonged high-speed blending: potatoes can become gluey when overworked. A brief blend gives a smooth texture without needing flour or another thickener.
Serve hot. Ladle the soup into warm bowls and scatter over the chopped chives or parsley. Add black pepper at the table. Serve promptly while the soup is creamy and hot, with bread alongside for dipping.

Tips

Wash leeks carefully. Soil often hides between the layers, especially near the white base. Rinsing sliced leeks in a bowl and lifting them out leaves grit behind; a quick rinse of whole leeks is less reliable.
Choose a potato with some structure. Yukon Golds make a naturally creamy soup and hold their flavor well. Russets also work and break down readily, but can make the soup thicker and more prone to a pasty texture if blended for too long.
Keep the heat gentle after adding dairy. A hard boil can make cream look grainy or separated. Warm the finished soup slowly and stir frequently. If using whole milk instead of cream, the result will be thinner and less rich, but still pleasant.
Season in stages. Stock varies in saltiness, so start with the listed amount and adjust after blending. If the soup tastes flat, a little more salt often helps; if it is already salty, thin it with unsalted water or stock rather than adding more cream.

Serving Suggestions

Serve a bowl as a light lunch with brown soda bread, crusty sourdough, or buttered toast. For a fuller meal, pair it with a green salad dressed with a sharp mustard vinaigrette or with a simple cheese sandwich. The soup is mild, so a crisp, tangy side balances its soft texture and buttery flavor.

For an attractive finish, add chives or parsley, a small swirl of cream, and freshly ground pepper. A few toasted bread cubes add crunch; keep them separate until serving so they do not soften. If the soup is part of a larger dinner, offer modest portions before roasted vegetables, a savory pie, or another main dish.

Variations

Make it dairy-free: Replace the butter with another tablespoon of olive oil and omit the cream. For a softer finish, stir in 1/2 cup (120 ml) unsweetened oat milk or a dairy-free cooking cream. Choose an unsweetened product, since vanilla or sweetened varieties will change the soup’s flavor.

Add greens: Stir in 2 packed cups (60 g) of chopped baby spinach during the last 2 minutes of cooking, before blending. For kale, use 2 cups (80 g) finely chopped leaves and simmer for 5 to 7 minutes, until tender. Greens deepen the color and make the soup taste more vegetal.

Use celery or herbs: Add 1 diced celery stalk, about 40 g, with the onion for a slightly more savory base. Fresh parsley stems, a small sprig of rosemary, or a pinch of marjoram can replace the thyme. Remove woody herb stems before blending; rosemary is potent, so start with a small sprig.

Leave it chunky: Skip the blender and mash about one-third of the cooked potatoes with a potato masher, leaving the rest in pieces. This gives the soup a hearty, spoonable texture. Add a little extra stock if the mashed potatoes make it thicker than you prefer.

Storage and Reheating

Cool leftovers promptly and refrigerate them within 2 hours of cooking in a shallow, covered container. The soup keeps for 3 to 4 days in the refrigerator. Because potatoes can thicken as they sit, loosen each portion with a splash of water or stock before reheating. Warm it in a saucepan over medium-low heat, stirring often, until steaming throughout; avoid a rolling boil, especially after adding cream.

For food safety, reheat leftovers to 165°F (74°C), checking the center with a food thermometer. Freeze the soup for up to 2 months in a freezer-safe container, leaving some room for expansion. Cream-based soups can separate slightly after thawing; thaw overnight in the refrigerator and whisk gently while reheating. If you know you will freeze part of the batch, freeze it before adding the cream, then add cream after thawing and warming.

Frequently Asked Questions

Do I have to peel the potatoes?
No. Yukon Gold skins are thin, and leaving them on adds a little texture and color. Scrub the potatoes well first. Peel them if you want a paler, more uniformly smooth soup or if the skins are thick and rough.

Can I make this soup without a blender?
Yes. Use a potato masher to crush some of the tender potatoes and leave the rest in chunks. The soup will be rustic rather than silky, but it will still thicken naturally. Do not use a whisk to break up all the potatoes, since vigorous stirring can make them gummy.

Can I prepare it ahead?
Yes. Cook the vegetables and potatoes, blend the soup, and refrigerate it without the cream for up to 3 to 4 days. Reheat gently, stir in the cream near the end, and adjust the consistency with stock or water. Follow the same 2-hour cooling limit as for other cooked leftovers.

What can I use instead of leeks?
Use 1 large yellow onion, about 8 ounces (225 g), and add 1 finely sliced scallion if available. The soup will still be good, but it will taste more directly oniony and lose the mild, slightly sweet character that leeks provide. Celery alone is not a close flavor replacement.

Why did my soup turn gluey?
Potatoes release starch when they are cut and cooked, and intensive blending can make that starch feel sticky. Blend only until smooth, using short bursts, and avoid running potatoes through a high-speed blender for an extended time. If the texture is already thick, thin it gradually with hot stock or water.

Can I use vegetable stock instead of chicken stock?
Yes. Vegetable stock keeps the soup meat-free, while chicken stock gives it a more savory background. Either works, but check the label and taste before adding all the salt because some prepared stocks are considerably saltier than others.

More recipes to cook

Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

Spotted an error? Tell us and we will correct it (corrections policy).