Preparation

• Combine the crème fraîche and horseradish in a small bowl. Season to taste with salt, pepper, and more horseradish, if you like.
• Put the potatoes in a medium pot, cover with cold water (by about 2 inches), and add 1 Tbs. salt. Bring to a boil, turn down the heat to medium low, and simmer gently until the potatoes are tender when pierced with a skewer, 15 to 20 minutes. Reserve about 1/4 cup of the water and drain the potatoes.
• Let the potatoes cool for a moment and then slightly smash them with a wooden spoon just until they crack open. Return the potatoes to the pot over medium heat. Add the butter and 3/4 tsp. salt. Stir to coat the potatoes with the butter. Add a few tablespoons of the reserved potato water to help coat and glaze the potatoes. Stir in the parsley, taste, and adjust the seasoning with salt and pepper.
• Top each serving with crème fraîche and a sprinkle of pepper.

Make Ahead Tips

After boiling and draining the potatoes, you can hold them for a few hours before finishing them. Reheat them by immersing in boiling water until they’re heated through, about 5 minutes, then proceed with the recipe as directed above.