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Fresh Foodies & Home Cooks Farmers (CSA Producers) Organizers & Educators

Potato au Gratin with Leeks and Turnip

Layers of potatoes, turnips, leeks, and Gruyère bake in creamy garlic sauce for a golden, comforting gratin—rich, savory, and perfect for cold nights.

Ingredients:

  • 1 cup whole milk
  • 1 cup heavy cream
  • 3 large cloves garlic (minced)
  • Salt and freshly ground black pepper
  • 2 tbsp butter (divided)
  • 3 leeks (white section only) (thoroughly washed and thinly sliced)
  • 1 pound Russet potatoes (peeled and thinly sliced)
  • 1 pound turnips (peeled and thinly sliced)
  • 2 cups shredded Gruyère cheese

Instructions:

  1. Preheat the oven to 365°F.
  2. In a saucepan set to medium heat, combine the milk, cream, and garlic; season to taste with salt and pepper. Do not boil. Decrease the heat and simmer for another 5 minutes, then set aside. (Do not be shy on the salt—it will help flavor the potatoes and turnips.)
  3. In a small pan over medium heat, melt 1 tablespoon of the butter and add the leeks. Cook for 7 to 8 minutes, until the leeks start to brown, stirring frequently; then set aside.
  4. Spread the remaining butter around a 9-by-13-inch baking dish, covering the bottom and sides. Arrange half of the potatoes, then half of the turnips in the dish, lightly seasoning each layer with salt and pepper. Add 1 cup of the Gruyère cheese and the cooked leeks on top of this layer. Pour enough of the cream mixture over the top to just barely cover.
  5. Repeat with the remaining potatoes and turnips, again seasoning lightly with salt and pepper. Top with the remaining cheese, and drizzle the rest of the cream mixture on top, making sure to moisten everything evenly.
  6. Bake for 40 to 45 minutes, until the top is golden brown and the vegetables can be pierced easily with a sharp knife.
Posted:
December 14, 2015
Updated:
November 10, 2025

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    Page published:
    December 14, 2015
    Last updated:
    November 10, 2025
    Potato au Gratin with Leeks and Turnip
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