Colcannon is Irish comfort food at its best — buttery mashed potatoes folded with greens and scallions.
It’s simple, but like most simple food, it depends entirely on good ingredients and proper technique. The potatoes should be smooth but not gluey, the kale and scallions softened in butter, and the whole thing finished with enough cream and Irish butter to make it rich without becoming heavy.
Serve it hot with a well in the center of melting butter the way it's mean't to be eaten.
Technique You’ll Learn
Great mashed potatoes come down to two things: starch and temperature.
While the potatoes are boiling, heat the butter and cream together in a small saucepan. Warm dairy is essential. If you add cold cream to hot potatoes, the starch tightens and the texture suffers.
Once the potatoes are tender, drain them thoroughly and let them steam dry for a minute or two. You’re looking for the edges to turn white and slightly flaky. That’s excess moisture evaporating. Too much water and the mash becomes loose and bland.
Mash the potatoes while they’re still steaming hot. This is when the starch is open and ready to absorb the butter and cream.
Add the warm dairy gradually and whip just until smooth. Then stop. Overworking the potatoes — especially as they cool — is what turns them gluey.
For colcannon, the kale and scallions are sautéed separately in butter and folded in at the end. The greens stay tender, the potatoes stay light, and the flavors stay clean.
The result is exactly what the dish should be: buttery potatoes, bright greens, and a texture that’s soft and fluffy instead of dense paste.
Ingredient Intelligence
Potatoes
The foundation of colcannon is properly mashed potatoes. Yukon Gold potatoes are ideal because they combine moderate starch with a naturally buttery flavor, producing a smooth mash that still feels light. Russet potatoes also work well and create a slightly fluffier texture due to their higher starch content. What matters most is technique: the potatoes must be drained thoroughly and mashed while still steaming hot so the butter and cream absorb evenly.
Kale
Traditional colcannon often uses cabbage, but kale adds a deeper, earthier flavor and holds its structure well in the mash. Remove the thick stems before cooking, then sauté the leaves briefly in butter until tender. Cooking the greens first softens their texture and prevents excess moisture from watering down the potatoes.
Irish Butter
Irish butter is made from the milk of grass-fed cows and typically contains 82–85% butterfat, compared with about 80% in standard American butter. The higher fat content creates richer flavor and a silkier texture in mashed potatoes. It also gives the butter its natural golden color. A widely available example is Kerrygold, which works beautifully in colcannon.
Cream, Half-and-Half, or Milk
The dairy you choose determines the richness of the mash. Heavy cream produces the most luxurious texture and a stable, velvety result. Half-and-half creates a slightly lighter mash while still providing enough fat for smoothness. Milk works but produces a looser texture and should be used more sparingly. The dairy should always be heated with the butter before adding it to the potatoes so the mash stays hot and absorbs the fat properly.
Scallions
Scallions add brightness and a gentle onion flavor that balances the richness of the potatoes. They’re folded in at the end so they remain fresh and slightly crisp rather than disappearing into the mash.
Salt
Potatoes absorb seasoning slowly, so the cooking water should taste lightly salty. This allows the potatoes to season from the inside as they cook. Final seasoning can then be adjusted once the mash is finished.Potatoes
Starchy potatoes are essential for smooth mashed potatoes. Yukon Golds are ideal because they combine the creamy texture of russets with a naturally buttery flavor. Avoid waxy potatoes such as red potatoes, which tend to produce a heavier mash.
Serving Suggestions
Colcannon pairs beautifully with classic Irish dishes:
- Irish whiskey glazed salmon
- Corned beef with mustard jus
- Roast lamb or pork
- Braised short ribs
For a traditional presentation, spoon the colcannon into a warm bowl and make a small well in the center. Add a pat of butter and let it melt slowly into the potatoes.
FAQ
Can I use cabbage instead of kale?
Yes. Savoy cabbage is the most traditional choice and works beautifully in colcannon.
Can colcannon be made ahead?
Yes. Reheat gently with a splash of cream or milk to restore the texture.
Can I add bacon?
Absolutely. Crisp bacon or Irish rashers add a smoky element that works very well with the buttery potatoes.
Colcannon
Equipment
- Colander
- Potato masher or ricer
- Medium sauté pan
- Small saucepan
- Wooden spoon or spatula
Ingredients
- 2 ½ pounds Yukon Gold or russet potatoes peeled and cut into large chunks
- Kosher salt for the water and to taste
- 6 tablespoons Irish butter divided
- ¾ cup heavy cream
- 4 cups kale stems removed and leaves chopped
- 4 scallions thinly sliced
- ¼ teaspoon freshly ground black pepper plus more to taste
Instructions
- Place the 2 ½ pounds peeled and cut potatoes in a large pot and cover with cold water by about 1 inch. Season the water generously with kosher salt and bring to a boil. Reduce to a steady simmer and cook for 15 to 18 minutes, or until the potatoes are fork-tender.
- While the potatoes are boiling, place ¾ cup heavy cream and 4 tablespoons of the Irish butter in a small saucepan. Warm gently over low heat until the butter is melted and the mixture is hot but not boiling.
- In a medium sauté pan, melt the remaining 2 tablespoons Irish butter over medium heat. Add the 4 cups chopped kale and cook for 3 to 4 minutes, stirring occasionally, until wilted and tender. Add the 4 sliced scallions and cook for 30 seconds more. Remove from the heat.
- Drain the potatoes thoroughly in a colander, then return them to the warm pot and let them sit for 1 to 2 minutes so the excess moisture evaporates. The edges should look slightly white and flaky.
- Mash the potatoes immediately while they are still steaming hot. Gradually add the hot butter and cream mixture, mashing and folding until the potatoes are smooth and creamy.
- Fold in the sautéed kale and scallions. Season with ¼ teaspoon black pepper and additional kosher salt to taste. Mix just until combined. Do not overwork the potatoes.
- Transfer to a serving bowl, make a small well in the center if desired, and finish with an extra pat of butter before serving.
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