Potato and Leek Gratin

Potato and Leek Gratin

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A mandoline will slice the potatoes quickly and to the exact same thickness, though a sharp knife will also work. Instead of burying the potatoes and leeks in cream, a drizzle of milk is added to...

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Ingredients

  • 1 teaspoon kosher salt, divided
  • 1 ounce Parmesan cheese, grated
  • 1 tablespoon unsalted butter
  • 1/2 teaspoon freshly ground black pepper
  • 1 1/2 pounds Yukon Gold potatoes, peeled and very thinly sliced
  • 1 large leek, trimmed, halved lengthwise, and sliced
  • 2 garlic cloves, smashed
  • 2 ounces Gruyère cheese, shredded
  • 2 1/2 cups whole milk

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