Irish Stew Soup with Tender Lamb and Root Vegetables

Irish stew soup is a brothier take on Ireland’s comforting lamb-and-potato stew, with tender lamb, potatoes, carrots, and herbs simmered together in a savory stock. The family and regional versions vary, but this one keeps the familiar ingredients while making enough broth to serve it by the bowl.

Ingredients

2 lb (900 g) boneless lamb shoulder, trimmed and cut into 1½-inch (4 cm) pieces
1½ tsp (8 g) fine salt, divided
½ tsp (1 g) freshly ground black pepper
2 tbsp (30 ml) neutral oil, such as canola oil
1 large yellow onion, about 7 oz (200 g), chopped
1 medium leek, about 5 oz (150 g), white and light-green parts, rinsed well and sliced
2 celery stalks, about 3½ oz (100 g), sliced
3 garlic cloves, about 9 g, finely chopped
8 cups (1.9 L) low-sodium lamb or beef stock
4 fresh thyme sprigs, about 2 g, or 1 tsp (1 g) dried thyme
2 bay leaves
1½ lb (680 g) waxy potatoes, such as Yukon Gold, cut into 1-inch (2.5 cm) chunks
3 medium carrots, about 10½ oz (300 g), peeled and cut into ½-inch (1 cm) slices
3 tbsp (12 g) chopped fresh flat-leaf parsley

Instructions

Prepare the lamb and vegetables. Pat the lamb dry with paper towels; dry surfaces brown more readily than damp ones. Season the pieces with 1 teaspoon of the salt and the black pepper. Chop the onion, rinse and slice the leek, and prepare the celery, garlic, potatoes, and carrots before you begin cooking. Leeks can hold grit between their layers, so separate the slices under cool running water and drain them well.
Brown the lamb. Heat the oil in a large, heavy Dutch oven or soup pot over medium-high heat. Working in two batches so the pieces have room, brown the lamb for about 15 minutes total, turning to color several sides. Transfer the lamb to a plate. Browning adds savory flavor, but it is not necessary to cook the lamb through at this stage. If the pot looks dry between batches, add a small splash of oil rather than crowding the meat.
Soften the aromatics and start the broth. Reduce the heat to medium. Add the onion, leek, and celery to the same pot and cook for 5 minutes, stirring and scraping up the browned bits. Stir in the garlic for about 30 seconds, just until fragrant. Return the lamb and any juices on the plate to the pot, then pour in the stock. Add the thyme, bay leaves, and remaining ½ teaspoon salt. Bring the liquid just to a gentle boil, then lower the heat so it simmers steadily, not vigorously.
Simmer the lamb. Cover the pot slightly ajar and simmer for 70 minutes, stirring occasionally. Keep the heat low enough that small bubbles break the surface; a hard boil can make the broth cloudy and cause the meat to tighten. If the liquid drops much below the level of the lamb, add a little hot water. The lamb will continue cooking with the vegetables, so it does not need to be fully tender yet.
Add the potatoes and carrots. Stir in the potato chunks and carrot slices. Return the soup to a gentle simmer and cook uncovered for 25 minutes, or until the potatoes are tender when pierced with a knife and the lamb is easy to cut with a spoon. Check the thickest lamb pieces with a food thermometer: USDA FSIS sets 145°F (63°C) with a 3-minute rest as the safe minimum for whole cuts of lamb. These slowly simmered shoulder pieces will generally cook beyond that minimum as they become tender.
Finish and serve. Remove the bay leaves and thyme stems. Take the pot off the heat and let it stand for 3 minutes before serving. Stir in the parsley, taste the broth, and add the remaining salt or more black pepper if needed. If you prefer a more soup-like bowl, ladle in extra hot stock or water; for a heartier consistency, mash a few potato pieces against the side of the pot and stir them back in.

Tips

Choose shoulder for tenderness. Lamb shoulder has enough connective tissue to become succulent during a slow simmer. Boneless leg works if that is what you can find, but it is leaner and may become firm if cooked too long. Cut the pieces evenly so they finish at roughly the same time.
Use stock with care. Low-sodium stock gives you control over the seasoning because it reduces slightly as the soup simmers. If you only have regular stock, begin with less added salt and adjust at the end. Water can replace up to 2 cups (475 ml) of the stock, though the broth will taste lighter.
Keep the simmer gentle. A rolling boil does not speed up tenderness in a useful way; it can break up the potatoes and leave the broth less clear. If the soup is bubbling hard, lower the heat and partially cover the pot.
Make the leek optional. Leeks add a mild, sweet onion flavor, but they are not essential. Replace the leek with another ½ medium onion, about 3½ oz (100 g); the soup will have a slightly more direct onion taste.

Serving Suggestions

Serve the soup hot in deep bowls, making sure each portion gets both broth and a generous share of lamb and vegetables. Chopped parsley brightens the rich broth, and a little black pepper at the table suits the lamb without masking its flavor. Set out crusty bread or Irish soda bread for dipping; its firm crumb is useful for soaking up the last of the soup.

For a fuller meal, pair a bowl with a simple green salad dressed with a sharp vinaigrette. The crisp, tangy greens balance the soft potatoes and savory broth. If serving a crowd, keep the pot over very low heat only long enough to serve, rather than letting the potatoes continue to cook and break apart. A small dish of extra parsley and a pepper mill let everyone finish their own bowl.

Variations

Use mutton instead of lamb: Mutton is a traditional choice in some versions of Irish stew and has a deeper flavor. It can be less tender than young lamb, so allow extra simmering time and judge doneness by tenderness rather than the clock alone. Keep the broth at a gentle simmer and add the potatoes and carrots only when the meat is close to tender, so the vegetables do not overcook.

Add pearl barley: For a more filling, grain-based variation, add ½ cup (100 g) pearl barley when you return the lamb to the pot, along with 1 extra cup (240 ml) stock or water. Barley thickens the broth and gives the soup a pleasantly chewy texture; check the package guidance because cooking times vary. If the barley absorbs more liquid than expected, loosen the finished soup with hot stock.

Make it with beef: Replace the lamb with 2 lb (900 g) beef chuck cut into similar-sized pieces and use beef stock. The result is a beef-and-root-vegetable soup rather than Irish lamb stew, but the same gentle braising method works. Brown the beef in batches, and allow more time if it is still firm when the vegetables are ready.

Use dried herbs: If fresh thyme is unavailable, the measured dried thyme in the ingredient list works well. Add it with the stock so it has time to infuse. Avoid adding a large handful of dried herbs as a direct replacement for fresh sprigs; dried herbs are more concentrated and can dominate the broth.

Storage and Reheating

Let the soup stop steaming heavily, then refrigerate it within 2 hours of cooking in shallow, covered containers. It keeps for 3–4 days in the refrigerator. The potatoes may absorb some broth as the soup sits, so add a splash of water or stock when reheating. For food safety, reheat leftovers to 165°F (74°C), checking the center with a food thermometer; on the stovetop, stir often and heat until the soup is steaming throughout.

To freeze it, cool the soup promptly and transfer it to freezer-safe containers, leaving a little room for expansion. Freeze for up to 3 months for best quality, then thaw overnight in the refrigerator before reheating. Potatoes can become slightly softer after freezing, but the soup remains useful for a quick meal. Freeze individual portions if you want to thaw only what you need, and avoid repeatedly cooling and reheating the whole pot.

Frequently Asked Questions

Is Irish stew soup the same as Irish stew?
They share the familiar combination of lamb or mutton, potatoes, and other simple vegetables, but this recipe has extra broth so it can be served as soup. Irish stew recipes vary by household and region; some are thick and close to a braise, while others have more liquid. This version is deliberately spoonable and broth-forward.

Can I make this soup ahead?
Yes. Cook it through, cool it promptly, and refrigerate it for up to 3–4 days. The flavor will mingle as it rests, while the potatoes may soften and take up some broth. Reheat gently to 165°F (74°C), adding stock or water if you want to restore a looser soup consistency.

Can I make it without browning the lamb?
You can skip browning and add the seasoned lamb directly to the stock, but the finished broth will have less of the roasted, savory flavor created by the browned pieces and pot residue. If you skip that step, still soften the onion, leek, and celery before adding the liquid, and keep the simmer gentle.

What potatoes work best?
Waxy potatoes, including Yukon Gold and red potatoes, usually hold their shape well during a simmer. Russets also work, but they are starchier and more likely to break down, which makes the broth thicker and less clear. Cut any variety into similar-sized chunks so the pieces cook evenly.

Can I cook Irish stew soup in a slow cooker?
Yes. Brown the lamb and soften the aromatics on the stovetop first for the best flavor, then transfer them to a slow cooker with the stock, thyme, and bay leaves. Cook until the lamb is tender, then add the potatoes and carrots for the final stretch so they do not turn mushy. Follow your cooker’s instructions and confirm the lamb reaches the safe minimum temperature noted above.

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

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