Colcannon Traditional Irish Creamy Potato, Cabbage and Spring Onion Mash

Traditional Irish colcannon is a deeply comforting mash of fluffy potatoes, buttery cabbage, and mellow green onions, all wrapped in rich whole milk and butter. It is simple, honest food, yet when you infuse the milk with onion and season the cabbage properly, the flavour becomes surprisingly luxurious and perfect alongside roasted meats or as a hearty vegetarian centrepiece.

Prep: 20 minutes

Cook: 25 minutes

Serves: Serves 4

Dietary: Vegetarian, gluten free

By Backyard Chef
From Youtube

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This traditional Irish colcannon is rich in butter and whole milk, which pushes it towards a Nutri-Score D on the scale, but it does fold in a decent amount of cabbage or kale and spring onions for fibre and micronutrients. Think of it as an occasional, celebratory side rather than an everyday dish, especially if you serve it next to fattier meats.

Approximate nutrition per serving (guide only): around 330–380 kcal, moderate carbohydrates from the potatoes, higher fat from butter and milk, a small amount of protein, and useful fibre from the cabbage or kale and onions.

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Equipment

• Large pot for boiling potatoes
• Second large pot for cabbage or kale
• Colander for draining
• Sharp chef’s knife 🛒 Check out Amazon’s Choice
• Chopping board
• Skillet or small saucepan for milk infusion
• Potato masheror Potato ricer

Method

Stage 1 – Cook and “dry through” the potatoes (about 20 minutes)

1. 1. Get the potatoes on by placing the peeled, evenly cut chunks into a large pot, covering them with cold water, and adding a generous pinch of salt so the seasoning goes right into the potato from the start.
   2. Bring to a gentle boil over medium heat, then simmer until the potatoes are fork-tender; you should be able to slide a knife or fork in easily without the pieces falling apart.
   3. Drain the potatoes well in a colander, then immediately return them to the warm pot and set it back on a very low heat for a few minutes, shaking the pan gently so the steam escapes and the potatoes “dry through” instead of turning watery.
   4. Set the dried potatoes aside, off the heat but still in the warm pot, so they stay hot and fluffy while you sort out the cabbage and the milk infusion for the colcannon.

Stage 2 – Blanch and pre-season the cabbage (about 10 minutes, overlapping with potatoes)

1. 1. Prep the cabbage or kale by removing any tough outer leaves and the hard inner stalk, then slicing the leaves into fairly uniform pieces so they cook evenly in your colcannon.
   2. Boil a second pot of water, lightly salted, and add the cabbage; cook for about 5–6 minutes until the greens are tender but still bright, not drab or overcooked.
   3. Drain the cabbage thoroughly in a colander, pressing lightly with a spoon if needed to remove excess water so it does not water down your colcannon mash.
   4. Pre-season the cabbage by melting a good knob of butter in a pan over low to medium heat, then tossing the drained cabbage with black pepper and a pinch of salt, whisking it through the butter just until coated and glossy without letting it brown.

Stage 3 – Make the milk and spring onion infusion (about 5–7 minutes)

1. 1. Pour the whole milk into a small pan or skillet and add a generous amount of butter along with the sliced spring onions; you want enough butter to feel indulgent, because it is the heart of traditional Irish colcannon.
   2. Warm the milk gently over a low flame until it is steaming and the butter has melted, then let the spring onions simmer softly in the milk for a few minutes so they lose their harsh raw bite without falling apart.
   3. Take the pan off the heat once the onions are tender and fragrant; at this point the milk is carrying onion flavour “all the way through,” ready to be absorbed by the potatoes for a really professional-tasting colcannon.

Stage 4 – Mash, combine, and adjust the texture (about 10 minutes)

1. 1. Start mashing the potatoes in their warm pot using a potato masher for a traditional, slightly rustic texture; add a fresh knob of butter as you mash so it melts directly into the potatoes.
   2. Gradually pour in the warm milk and onion infusion, a little at a time, mashing and folding as you go so the colcannon turns creamy without becoming gluey; stop when it feels soft and spoonable but still holds gentle peaks.
   3. Fold in the buttery cabbage using a wooden spoon, gently lifting and turning so the greens are evenly distributed through the potato without breaking down into mush.
   4. Taste and season with more salt and black pepper as needed; the seasoning should feel assertive enough to stand up to roasted meats but still let the butter and onion shine.
   5. Adjust the texture with a splash more warm milk if the colcannon feels too stiff, or a tiny extra knob of butter if you want an even richer finish for the table.

Stage 5 – Plate and serve with the classic butter well (about 3 minutes)

1. Spoon the colcannon into a warm serving bowl, piling it high and smoothing the top slightly while keeping that homely, rustic look that suits a traditional Irish colcannon.
2. Create a deep well in the centre with the back of your spoon, then drop in a final pat of cold butter and let it melt into a “golden pool” that guests can swipe their spoonfuls of colcannon through as they serve.