British Pea Soup: A Hearty Split Pea Recipe

British pea soup is a hearty, homestyle soup made with dried green split peas, vegetables, and herbs, simmered until the peas soften and thicken the broth. This meat-free version is warming and filling, with leeks and a little lemon to balance the peas; British households make many variations, so the recipe is easy to adapt.

Ingredients

1½ cups (300 g) dried green split peas
1 tablespoon (15 ml) olive oil or butter
1 medium leek, about 1 cup (150 g) sliced, white and light-green parts only
1 medium yellow onion, about 1 cup (150 g) chopped
2 medium carrots, about 1 cup (160 g) chopped
2 celery stalks, about 1 cup (100 g) chopped
2 garlic cloves (6 g), finely chopped
1 medium potato, about 1 cup (200 g) peeled and diced; optional, for a thicker soup
6 cups (1.4 L) low-sodium vegetable stock
2 cups (480 ml) water, plus more as needed
2 dried bay leaves
1 teaspoon (1 g) dried thyme, or 1 tablespoon (3 g) fresh thyme leaves
½ teaspoon (3 g) fine salt, plus more to taste
¼ teaspoon (0.5 g) ground black pepper, plus more to taste
1 tablespoon (15 ml) lemon juice, or to taste
2 tablespoons (8 g) chopped fresh parsley, for serving

Instructions

Rinse and prepare the vegetables. Put the split peas in a sieve and rinse under cool running water, picking out any small stones or damaged peas. Trim and wash the leek carefully, separating the layers to remove grit, then slice it. Chop the onion, carrots, celery, garlic, and, if using, potato. This preparation takes about 15 minutes; the peas do not need to be soaked.
Soften the vegetables. Warm the oil or butter in a large, heavy-bottomed pot over medium heat. Add the leek, onion, carrots, and celery. Cook for about 8 minutes, stirring now and then, until the onion and leek are soft but not browned. If the vegetables start sticking, add a tablespoon of water rather than turning the heat up. Stir in the garlic and cook for 30 seconds.
Add the peas and liquid. Tip in the rinsed split peas and the diced potato, if using. Add the stock, water, bay leaves, thyme, salt, and pepper. Stir and bring the pot to a boil, then immediately reduce the heat to low. A gentle simmer is best: a hard boil can make the bottom catch before the peas are tender.
Simmer until tender. Partially cover the pot, leaving a small gap for steam to escape, and simmer for about 60 minutes. Stir every 10 to 15 minutes, scraping the bottom, and check that the soup is bubbling gently rather than vigorously. If it becomes thicker than you want before the peas are soft, stir in ½ cup (120 ml) water at a time. Split peas vary in age and can take longer to soften, so continue simmering for up to 10 minutes if needed. The peas should crush easily with the back of a spoon.
Choose your texture. Remove the bay leaves. For a rustic soup, mash some of the peas against the side of the pot with a wooden spoon and leave the rest whole. For a smoother finish, use an immersion blender in short bursts, keeping the blade below the surface to avoid splashes. You can also blend about half the soup in a countertop blender, working in batches and following the blender’s instructions for hot liquids. Do not fill a blender jar to the top with steaming soup.
Season and finish. Stir in the lemon juice and taste. Add more salt, pepper, or lemon a little at a time; low-sodium stock needs more salt than regular stock. If the soup is too thick, loosen it with hot water or stock. If it is thinner than you prefer, simmer uncovered for a few minutes, stirring often. Serve hot with chopped parsley. The cooking time is about 1 hour 15 minutes, including softening the vegetables and finishing the soup; allow extra time if the peas are still firm.

Tips

Wash the leek well. Grit hides between the leek’s layers. Slice it first, then rinse the pieces in a bowl of water and lift them out, leaving any grit behind. A thoroughly cleaned leek gives the soup a pleasantly mild, savory flavor.
Use the right peas. Dried green split peas are peeled and split, so they soften without soaking and thicken the soup as they cook. Whole dried peas take longer and may need soaking according to their package directions. Frozen garden peas are not a direct substitute: they cook quickly and make a lighter, sweeter soup with a different texture.
Keep the simmer gentle and stir regularly. Split peas settle as the soup thickens, which can make them stick to the base of the pot. Use a heavy pot if available and scrape its bottom when stirring. Add water gradually if the liquid reduces too quickly, especially during the last half hour.
Adjust thickness after cooking. The soup will continue to thicken as it stands, and it will be thicker again after chilling. Stir in hot water or stock when reheating rather than adding a large amount before you know how much it needs. If you accidentally thin it too far, simmer it uncovered until some liquid evaporates.

Serving Suggestions

Serve the soup in warm bowls with parsley and a little black pepper. Crusty bread, a bread roll, or buttered toast makes a useful accompaniment for scooping up the thick broth. For a simple meal, add a green salad dressed with a sharp vinaigrette; its crispness and acidity contrast nicely with the soft, earthy peas. A small spoonful of plain yogurt or crème fraîche can be added at the table for a creamy finish, though neither is necessary.

If you are serving several people, keep the pot over very low heat only until everyone is ready, stirring often and adding a splash of water if the surface begins to thicken. Set out lemon wedges, pepper, and extra parsley so diners can adjust their own bowls. The soup is naturally filling, so modest portions alongside bread or a salad are often enough for lunch, while larger bowls work well as a simple supper.

Variations

Add ham: A common British-style variation includes ham. Stir 1 cup (150 g) of diced, fully cooked ham into the pot near the end, allowing it to heat through; if using leftover cooked ham, reheat the soup to 165°F (74°C), the USDA FSIS safe minimum for leftovers. Ham is salty, so taste before adding extra salt. A ham hock can also be simmered with the peas for a smoky broth, but it changes the timing and requires checking the hock’s package directions for safe preparation.

Make it dairy-free or richer: The base recipe is dairy-free when made with olive oil and vegetable stock. For a richer bowl, use butter to soften the vegetables or finish each serving with a little cream. For a vegan meal, choose vegetable stock and olive oil, and top with parsley or toasted bread rather than dairy.

Change the herbs or vegetables: Replace dried thyme with 1 tablespoon (3 g) fresh thyme, or add 1 teaspoon (2 g) chopped fresh rosemary with care because its flavor is strong. A handful of spinach can be stirred in during the final minutes until wilted. For a sweeter, lighter take, cook the split peas as written, then add 1 cup (150 g) frozen peas for the last 3 to 4 minutes and blend only part of the soup. That variation tastes greener and less traditionally earthy.

Make it smoother or chunkier: Blend all of the soup for a velvety texture, or leave it entirely unblended for a more rustic bowl. If you want a thicker soup without adding potato, mash a cupful of cooked peas and stir them back in. For a thinner broth, add stock gradually at the end; too much liquid added at the start can make it harder to judge the finished consistency.

Storage and Reheating

Cool the soup and refrigerate it within 2 hours of cooking, divided into shallow, covered containers so it cools promptly. It keeps for 3 to 4 days in the refrigerator. The soup thickens as it sits, which is normal; stir in a little water or stock before reheating. Reheat only the portion you plan to serve, stirring frequently on the stovetop until it is steaming throughout and reaches 165°F (74°C), the USDA FSIS safe temperature for reheated leftovers. If using a microwave, cover loosely, stir partway through, and check the temperature in more than one spot.

For longer storage, freeze cooled soup in meal-size, freezer-safe containers, leaving a little room for expansion. It is best used within about 3 months for quality. Thaw it overnight in the refrigerator or reheat it from frozen in a covered saucepan over low heat, stirring as it loosens. Add water or stock to restore the consistency, then heat to 165°F (74°C). Do not leave soup at room temperature for more than 2 hours.

Frequently Asked Questions

Do I need to soak split peas before making this soup?

No. Dried green split peas generally do not need soaking; rinsing them and simmering until tender is enough. Skipping a soak also makes the timing simpler. If the peas are old or have been stored for a long time, they may take longer to soften, so judge by texture rather than relying only on the clock.

Can I make British pea soup with yellow split peas?

Yes. Yellow split peas work in the same quantity and cook in a similar way, though their flavor is often a little milder and earthier and the finished color will be golden rather than green. Check them for tenderness as they simmer, since age and storage conditions affect cooking time. Adjust the seasoning at the end as you would with green peas.

Why are my split peas still hard?

They may need more time, especially if they are older, or the simmer may have been too low to cook them steadily. Keep the pot at a gentle simmer and add water if the soup is getting thick before the peas soften. Acidic ingredients can slow softening, which is why the lemon juice goes in at the end rather than at the start.

Can I make the soup ahead?

Yes. Make it up to 3 or 4 days ahead and refrigerate it promptly. Its flavor settles as it stands, but the texture will become thicker, so loosen it with water or stock while reheating. Heat it thoroughly to 165°F (74°C) and stir well before serving. For a fresh finish, add parsley and a little lemon juice just before it reaches the table.

Can I use frozen peas instead of dried split peas?

Not as a one-for-one replacement in this recipe. Frozen peas are already tender and need only a few minutes of cooking, while dried split peas need a long simmer to soften and thicken the soup. You can make a different, quicker green pea soup with frozen peas, but use a recipe designed for them; adding them here in place of split peas would leave you with a much thinner result and different flavor.

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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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