Potato Leek Gratin

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  • Potato-Leek Gratin in a baking dish.
    Last week I made Potato & Leek Soup and my whole family enjoyed it.  It was my first time using leeks as an ingredient and I was wondering what to do with the leftover leeks.  Maybe the same soup again?

    Then my fellow blogger, Shannon from Living with Umami (unfortunately her blog doesn’t exist anymore) told me she was going to cook Potato Leek Gratin.  I LOVE gratin dish.  It’s one of my favorites since childhood.  There is no way I will pass on making this dish.

    Shannon is my new cool foodie friend and she is genuinely nice.  Since I joined FoodBuzz (a food blog community) last month I’ve met many nice wonderful food bloggers like her.  Shannon made the gratin and shared the recipe on her blog.  On the same night I also cooked her yummy gratin!  It was so good!

    Some of you already know I love potatoes but that’s not only the reason.  My husband who is not into potatoes also loved the dish.  I guess it all just depends on how you prepare the ingredient.  Enjoy!

    Potato-Leek Gratin, chicken, and salad on a plate.

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    5 from 2 votes
    Potato-Leek Gratin
    Potato-Leek Gratin
    Prep Time
    20 mins
    Cook Time
    1 hr
    Total Time
    1 hr 20 mins
     I LOVE gratin dish.  It's one of my favorites since childhood.  There is no way I will pass on making this dish.
    Course: Main Course
    Cuisine: Japanese
    Keyword: creamy, gratin, leek, potato
    Servings: 4
    Author: Nami
    • 3 Tbsp unsalted butter
    • 2 stalks leeks
    • 1 tsp kosher/sea salt (use half for table salt)
    • ¼ tsp thyme (fresh or dried)
    • Freshly ground black pepper
    • ½ cup heavy (whipping) cream
    • 2 cups Parmigiano-Reggiano cheese (grated)
    • 2 cups Mexican style cheese
    • 3 russet potatoes (3 potatoes = 1.5 lbs)
    • green onions/scallions (chopped, to garnish)
    • 1 Tbsp panko (Japanese breadcrumbs)
    1. Gather all the ingredients.

      Potato-Leek Gratin 1
    2. Rinse the leeks and cut in half lengthwise. Chop into 1” pieces.
      Potato-Leek Gratin 2-a
    3. Carefully wash the leeks again in running water.
      Potato-Leek Gratin 2-b
    4. Butter a baking dish.
      Potato-Leek Gratin 3
    5. In a large skillet, heat the rest of butter on medium high heat and add leek.
      Potato-Leek Gratin 4-a
    6. Cover and let simmer for 20 minutes. Stir occasionally and cook until leeks are soft.
      Potato-Leek Gratin 4-b
    7. Meanwhile, peel and slice the potatoes into ¼” pieces.
      Potato-Leek Gratin 5-a
    8. Soak in water until you are ready to use them (prevent from changing color).
      Potato-Leek Gratin 5-b
    9. When leeks are soft, add thyme, salt, pepper, and heavy whipping cream. Simmer another 5 minutes until the sauce gets thickened.
      Potato-Leek Gratin 6-b
    10. Preheat an oven to 400F. Divide the potato, leek mixture, and each cheese according to your baking dish size. I divided them in half as this baking dish is a shallow one.
    11. Layer one portion of potatoes in the baking dish.
      Potato-Leek Gratin 7-a
    12. Then layer one portion of leek mixture.
      Potato-Leek Gratin 7-b
    13. Layer one portion of each cheese. Repeat for each layer.
      Potato-Leek Gratin 7-c
    14. Sprinkle Panko and green onion on top.
      Potato-Leek Gratin 8
    15. Cover with the aluminum foil and bake for 45 minutes. To check whether the dish is done, test by inserting a skewer through the foil. If the skewer is able to go through the potato smoothly then it’s ready. Remove the cover and change oven setting to broil. Broil for 2-3 minutes until golden brown on top. Be careful not to broil for too long since you don’t want to burned the dish.
    16. Remove from the oven and let it sit another 15 minutes before it’s ready to serve.
    Recipe Notes

    Adapted from Living with Umami (blog doesn't exist).


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