"The tricks to achieving very creamy mashed potatoes are to not overcook them and to whip them just until smooth (if you overwhip, they'll get gluey). Serve some of the butter on the side, so guests can determine their level of richness...."
INGREDIENTS
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6 large russet potatoes (about 5 lbs.), peeled and cut into chunks
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1 pt. half-and-half
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4 teaspoons kosher salt
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1/2 teaspoon pepper
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1 leek, white and light green parts only, sliced
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1 large shallot, sliced
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2 green onions, sliced
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6 tablespoons butter