In a large pot, bring salted water to a boil. Add the cubed potatoes and chopped carrot.
Cook until the potatoes and carrot are tender, about 15-20 minutes. Drain and set aside.
In a separate large skillet or pot, melt 2 tablespoons of butter over medium heat.
Add the finely sliced leek, shredded savoy cabbage, chopped onion, and minced garlic.
Sauté the vegetables until they are soft and tender, about 10-15 minutes.
In a large mixing bowl, combine the cooked potatoes and carrot.
Add the milk or cream and the remaining 2 tablespoons of butter.
Mash the potatoes and carrot until smooth and creamy. You can use a potato masher or an electric mixer.
Add the sautéed vegetables to the mashed potatoes and carrot. Mix well to combine.
Season with salt and pepper to taste. Add a pinch of nutmeg if desired.
Transfer the Stoemp to a serving dish.
Garnish with freshly chopped parsley.
Enjoy your meal!