The Frosterley TableWhat Are Mushy Peas? The Pub Side Dish Explained
- What are mushy peas?
- What is a marrowfat pea?
- Mushy peas vs garden peas: what is the difference?
- What should you ask about mushy peas if you have an allergy?
- Why are mushy peas soaked in bicarbonate of soda?
- Why are mushy peas so green?
- Is pease pudding the same as mushy peas?
- How are mushy peas served in British pubs?
- Sources
What are mushy peas?
Mushy peas are dried marrowfat peas, a starchy type of pea left to mature and dry in the field, that are soaked overnight, usually with bicarbonate of soda, then simmered until they collapse into a thick, spoonable green mash seasoned with salt and pepper. They are not mashed garden peas. They are the traditional partner to fish and chips, and in the North of England to a hot pie.
The Wikipedia entry on mushy peas describes them as "dried marrowfat peas which are first soaked overnight in water with sodium bicarbonate", then rinsed and simmered, and adds that "The mush is seasoned with salt and pepper." What that leaves out is why the dish tastes as it does, why it is so improbably green, and what a diner with an allergy or a meat-free diet may need to ask. If peas or other legumes are a problem for you, read the allergy section first.
What is a marrowfat pea?
A marrowfat pea is an ordinary pea, Pisum sativum, picked late rather than young. The Wikipedia entry on marrowfat peas describes them as green peas "allowed to dry out naturally in the field", unlike garden peas, which are picked early, and notes that they are starchy. That starch is the whole trick: simmered after soaking, the pea breaks down into something closer to porridge than a vegetable.
The British pulse supplier Hodmedod's sells marrowfat peas it calls "perfect for classic mushy peas", with simple instructions: "Soak overnight, drain and rinse," then simmer "for 40 to 50 minutes until tender." The same page lists a single ingredient, "Marrowfat Peas", and states "No Allergens". Everything else is what a kitchen adds.
Mushy peas vs garden peas: what is the difference?
Same plant, different stage of life, different dish. Garden peas are the young, fresh or frozen peas you get beside a gammon steak or a roast; they are sweet, they hold their shape, and mashing them gives you crushed peas, a lighter dish. Mushy peas start from the mature, dried pea and are cooked until the shape is gone.
Pub menus can carry up to four pea sides, and it helps to know them apart:
| Side | Made from | How it is cooked | What arrives |
|---|---|---|---|
| Mushy peas | Dried marrowfat peas | Soaked, then simmered to a mash | Thick, savoury, spoonable green purée |
| Garden peas | Young peas, fresh or frozen | Boiled briefly, served whole | Bright, firm, sweet |
| Processed peas | Dried marrowfat peas | Rehydrated and tinned whole | Soft whole peas in liquid |
| Pease pudding | Split yellow peas | Boiled, often with ham | Thick, pale, set or spreadable |
Processed peas are the tinned cousin: the marrowfat article says they are "reconstituted from dried peas" by soaking, blanching and heat-processing in brine, so they keep their shape.
What should you ask about mushy peas if you have an allergy?
A plain pot of mushy peas is peas, water, bicarbonate of soda and salt. The questions are about what else a kitchen adds, and about the pea itself.
Pea itself is not a regulated allergen. Allergy UK's pea factsheet states plainly: "Pea is not included in the list of the regulated allergens." That means a pub's allergen chart, built around the 14 allergens that UK food law requires businesses to declare, may not flag pea at all. The same factsheet makes a point that matters for this dish in particular: "Some people find that they can tolerate fresh and frozen peas and only react to mature and dried pea ingredients," because "The proteins in pea responsible for causing allergic reactions increase as the pea ripens, matures and is dried." Mushy peas are made from mature, dried peas, so tolerating garden peas is not evidence of tolerating mushy peas; that is a question for your GP or allergy clinic, not a menu.
Allergy UK's advice for anyone with a pea allergy is to ask staff "to take strict precautions" when eating out, and "If the food business is uncertain about their ability to do this, then it is not safe to eat the food served." If a severe reaction happens, it says adrenaline "should be given without delay, if available" and "an ambulance called urgently with anaphylaxis as the reason."
Other things worth asking about:
- Butter or cream. Some kitchens finish mushy peas with butter. Milk is one of the 14 regulated allergens, and the government's best-practice guidance for non-prepacked food says "Food businesses must inform consumers if they have used any of the 14 mandated allergens as an ingredient in their food."
- Stock. Peas cooked in ham or meat stock are not vegetarian, and nothing about their colour will tell you.
- Batter and the fryer. A pea fritter is battered and deep-fried, so ask what the batter contains and what else goes through the same fryer. The same guidance notes that "Cross contact with allergens should also be considered when they are not intentional ingredients in dishes."
- Mint sauce. Recipes vary between kitchens, so ask rather than assume.
The government's advice for consumers is to "Be clear about your allergy or intolerance when making your order", and it is blunt about the fallback: "If you have any doubt about the staff understanding the importance of your dietary needs, do not eat there." In a pub that usually means raising it at the bar when you order; our guide to pub etiquette covers how ordering works.
Why are mushy peas soaked in bicarbonate of soda?
Bicarbonate of soda (sodium bicarbonate, the baking raising agent) softens the peas and shortens the simmer. Hodmedod's says: "Adding bicarbonate of soda during soaking and/or cooking will soften the pulses and reduce the cooking time." Cooksinfo agrees that baking soda "is usually added to the soaking water, which makes the peas quite soft." The peas are drained and rinsed after soaking, then cooked in fresh water.
Patience still matters. Hodmedod's notes that cooking times "will be longer at higher altitudes and when cooking with hard water or older pulses." Packets of dried marrowfats, Cooksinfo adds, "may include a mint flavouring tablet", so some versions carry a hint of mint.
Why are mushy peas so green?
Left uncoloured, cooked marrowfat peas are far duller than most people picture. The mushy peas entry says "Most commercially produced mushy peas contain artificial colourants to make them green", that tartrazine (E102) was used in the past, and that as recently as 2019 major manufacturers were using brilliant blue FCF (E133) with riboflavin (E101).
That history matters because of one UK rule. The government's food additives guidance lists six colours, tartrazine (E102) among them, that require foods to carry the warning "May have an adverse effect on activity and attention in children." Brilliant blue and riboflavin are not on that list. Recipes change, so the label on the tin is the only reliable answer, and in a pub the useful question is whether the peas are made in the kitchen or come from a tin.
Is pease pudding the same as mushy peas?
No, and in this part of the country the difference matters. Pease pudding is made from split yellow peas rather than whole marrowfats; Wikipedia's entry on pease pudding calls it "A common dish in the north-east of England", notes that it is "often cooked with a bacon or ham joint", and says "It is often served with ham or bacon, beetroot and stottie cakes." It is paler and firmer than mushy peas, and because of the ham it is often not vegetarian. Anyone travelling the dales and towns in our County Durham guide is likely to meet both.
How are mushy peas served in British pubs?
The classic pairing is fried fish. The mushy peas entry calls them "a traditional accompaniment to fish and chips" throughout England and Scotland, and that is how they appear in our run-through of British pub food classics. In Northern England they are also "commonly served as part of a popular snack called pie and peas": a hot pie with a ladle of peas beside it. In Nottinghamshire, the same entry says, "they are traditionally accompanied by mint sauce", and they are "sometimes also packed into a ball, dipped in batter, deep-fried, and served as a pea fritter."
A good bowl is easy to spot. It is thick enough to hold a spoon for a second before slumping, seasoned enough to taste of something, and still carries the earthy sweetness of the dried pea. Watery peas suggest a thinned pot; a skin on top suggests a long wait on the hotplate. Neither is a disaster. Both are a reason to try the next pub. For the dishes around them, start with our pub food hub.
Sources
- Mushy peas, Wikipedia
- Marrowfat peas, Wikipedia
- Pease pudding, Wikipedia
- Marrowfat Peas product page, Hodmedod's
- Mushy Peas, Cooksinfo
- Reactions to Pea Protein, Allergy UK
- Allergen information for non-prepacked foods: best practice, GOV.UK
- Food allergy and intolerance advice for consumers, GOV.UK
- Food additives, GOV.UK
Frequently asked questions
Are mushy peas just mashed garden peas?
No. Garden peas are picked young and served fresh or frozen, so they are sweet and hold their shape; mashing them gives crushed peas. Mushy peas start from marrowfat peas that are left to mature and dry in the field. After soaking, usually with bicarbonate of soda, and simmering, their starch breaks down into a thick, savoury mash that garden peas cannot reproduce.
Are mushy peas vegetarian?
Plain mushy peas are made from marrowfat peas, water, bicarbonate of soda and salt, so the basic recipe contains no meat. A kitchen may still cook them in ham or meat stock, or finish them with butter, which contains milk. Ask how the pub makes them, and remember that pease pudding, a different North East pea dish, is often cooked with a bacon or ham joint.
Is pease pudding the same as mushy peas?
No. Pease pudding is made from split yellow peas rather than whole marrowfat peas, and it is often cooked with a bacon or ham joint. It is a common dish in the north-east of England and is often served with ham or bacon, beetroot and stottie cakes. It is paler and firmer than mushy peas and is often not vegetarian.
Why are mushy peas so bright green?
Cooked marrowfat peas are naturally much duller, so most commercially produced mushy peas contain added colours. Tartrazine (E102) was used in the past; as recently as 2019, major manufacturers were using brilliant blue FCF (E133) with riboflavin (E101). In the UK, tartrazine is one of six colours that require a warning about activity and attention in children. Check the tin's label, or ask a pub whether its peas are homemade.
I can eat garden peas. Does that mean mushy peas are safe for my pea allergy?
Not necessarily. Allergy UK notes that some people tolerate fresh and frozen peas but react to mature and dried pea ingredients, because the allergenic proteins increase as the pea ripens and dries. Mushy peas are made from dried peas. Pea is also not a regulated UK allergen, so allergen charts may not flag it. Ask your GP or allergy clinic, and tell staff about your allergy when ordering.