INGREDIENTS
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1 kg (2.2 pounds) potatoes, a mix of waxy and baking potatoes (if you prefer to use only one type, pick waxy potatoes, not too firm)
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500 ml (2 cups) milk (whole or part-skim, not skim; I don't recommend using non-dairy milk as the dish turns out watery)
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1 1/2 teaspoons salt
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freshly grated nutmeg
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1 clove garlic, sliced lengthwise
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3 tablespoons finely chopped chives (optional)
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60 ml (1/4 cup) heavy cream (use whipping cream in the UK and crème fraîche liquide in France)