Directions

1. Preheat broiler. Peel and quarter potatoes, and place in a medium saucepan; add enough cold water to cover. Bring to a boil over high heat; reduce heat to a simmer, and cook until tender when pierced with a fork, about 15 minutes. Drain potatoes and return to saucepan. Mash with a potato masher or pass through a ricer; cover pan to keep warm.
2. Meanwhile, in another saucepan, combine cabbage, leek, milk, 2 tablespoons butter, and nutmeg; season with salt. Cover, and cook over medium heat, stirring occasionally, until cabbage and leek is soft but not browned, about 15 minutes. Stir into potatoes.
3. Spread mixture in an 8-inch square baking dish. Make a small well in the center, and place under the broiler until lightly browned on top, about 5 minutes.
4. Remove from broiler. Place remaining 2 tablespoons butter in well. Serve immediately, spooning melted butter from well onto each serving, if desired.