Add the potatoes to a medium pot of cold, salted water.
2 pounds russet potatoes
Bring to a boil and cook until fork-tender, about 8-10 minutes.
While the potatoes are cooking, add 1 tablespoon of the butter to a large skillet over medium heat.
3 tablespoons butter
Once the butter is melted, add the cabbage and season with a pinch of salt and pepper.
4 cups green cabbage, salt, pepper
Cook until tender, stirring frequently, about 5 minutes. Set aside.
Warm the heavy cream, remaining 2 tablespoons of butter, and scallions in a small sauce pot over low heat until the butter is melted and warmed through.
1/2 cups heavy cream, 3 scallions, 3 tablespoons butter
Once the potatoes are done cooking, drain well and transfer to a large bowl.
Add half of the warm cream mixture and mash, gradually adding more of the cream and scallions until the desired fluffiness is achieved.
Stir in the cabbage and mace until evenly blended.
1/4 teaspoon ground mace
Season with salt and pepper, as needed.
salt, pepper
Garnish with fresh, minced parsley, if desired.