Reserve this decadent potato mash for special occasions.
Prick the skins of 1kg (4-6) large, floury potatoes in their skins and bake in a 190°C oven for 50-60 minutes or until very soft. Set aside for 10 minutes to cool, then remove the flesh and press it through a potato ricer or a coarse sieve (if using a sieve, use the back of a large ladle to push the potato through) into a large pot. Cover and keep warm.
Melt 180g butter in a pot and keep warm. Heat 180ml milk in another pot until it’s the same temperature as the butter and potatoes.
Set the potato over medium heat and add the butter slowly until the potato flesh can no longer absorb it (the amount will vary depending on the amount of moisture in the potatoes). Slowly add warmed milk and stir well with a spatula until the mixture looks soft and fluff y. Add ½ teaspoon flaky sea salt, a pinch of freshly ground white pepper and a pinch of nutmeg and mix to combine. Serve immediately. Serves 6-8 Cook’s note: If you want to make this side dish in advance, cool the prepared potato after final stage and refrigerate. To reheat, warm 150ml milk in a large pot. Add all the potato to the milk and set pot over a low heat. Use a spatula to whip until milk amalgamates. Stir continuously until potato is hot.