Ingredients:

  • 2 kg (5 lb) Russet or Yukon Gold potatoes, peeled and cut into uniform 5 cm (2-inch) pieces
  • 2 tablespoons (30 g) Kosher salt (for the cooking water)
  • 1 cup (240 ml) Whole Milk or Half-and-Half, warmed
  • ½ cup (120 ml) Heavy Cream, warmed
  • 225 g (8 oz / 2 sticks) Unsalted Butter, cut into cubes
  • 4 sprigs Fresh Rosemary, leaves removed and finely chopped (approximately 1 tablespoon)
  • ½ teaspoon White Pepper
  • ½ teaspoon Fine Sea Salt (or to taste)

Instructions:

  1. Place the peeled, uniformly cut potatoes in the large stockpot. Cover them generously with cold water (about 5 cm / 2 inches above the potatoes). Add the 2 tablespoons of Kosher salt.
  2. Bring the water to a rolling boil over high heat. Once boiling, reduce heat slightly and cook until the potatoes are fork-tender and beginning to flake (about 25–30 minutes).
  3. Drain the potatoes thoroughly in a colander. Return the drained potatoes to the empty hot pot (off the heat). Cover the pot with a clean tea towel or lid and let them steam dry for 5–7 minutes. This step is crucial for removing excess moisture.
  4. Place the unsalted butter in a heavy-bottomed saucepan over medium heat. Melt the butter, then increase the heat slightly. Whisk constantly. The butter will foam, then subside.
  5. Watch the milk solids at the bottom—they will turn from white to a deep amber/brown. As soon as you smell a distinct, nutty aroma (like toasted hazelnuts), remove the pan immediately from the heat to stop the browning process.
  6. Stir in the chopped rosemary, white pepper, and sea salt into the brown butter. Set aside to cool slightly.
  7. While the potatoes are still piping hot, run them through a potato ricer or food mill directly into a large clean mixing bowl. Do this quickly to prevent cooling.
  8. Pour the warmed milk and cream directly over the riced potatoes. Gently fold them in with a spatula until just combined.
  9. Drizzle the rosemary brown butter mixture over the potatoes. Fold gently—avoid aggressive mixing or whipping, as this activates starch and makes the mash heavy and gluey. Stop mixing the second the butter is incorporated and the color is uniform.
  10. Taste the mash. Adjust salt and pepper as necessary. Keep warm until serving.