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    Home » Garden To Table

    Zucchini Rice Gratin

    Published: Jul 26, 2020 · Modified: Oct 27, 2023 · 8 Comments

    This post contains affiliate links. As an Amazon Associate I earn from qualifying purchases.

    Jump to Recipe Save Recipe Saved!

    This French zucchini rice gratin is based on Julia Child's tian de courgettes au riz, and is a delicious side dish made with fresh summer squash, rice and cheese.

    zucchini rice gratin (tian de courgettes au riz) scooped onto a plate.

    I've been polling my friends with the same question over and over again.

    "What do you do when you've got too much zucchini?"

    Most years, I use my zucchini and yellow squash to make this vegan ratatouille or this baked zucchini and squash, and that's about it.

    This year, however, I found myself with an overwhelming amount of zucchini.

    And so, after numerous amounts of friendly advice and suggestions, as well as perusing all my cookbooks, I decided to make a zucchini gratin. It's basically the French version of a cheesy zucchini casserole.

    Follow along with my Instagram stories to see what I do with the rest of the zucchini!

    This zucchini rice gratin is based on Julia Child's recipe for tian de courgettes au riz from her cookbook Mastering the Art of French Cooking, Volume II.

    My version is an (ever-so-slightly) simplified version of Julia Child's recipe, and will walk you through some tips and tricks on how to use what you have on hand to make this savory and filling summer side dish.

    This is not a complicated dish, but there are quite a few different components of the recipe to prepare before you actually start cooking. I recommend reading through the entire recipe in full before you start cooking.

    How Much Zucchini Do I Need for This Gratin?

    You need about two pounds of zucchini or yellow squash.

    I use an analog kitchen scale to weigh my veggies, but if you don't have one, estimate four medium or six small squash.

    How to Grate Zucchini

    Start by grating your zucchini.

    I used the large side of my Joseph Joseph grater, but you could also chop the zucchini in a food processor.

    How to "Sweat" Zucchini

    Next, place the grated zucchini in a large mesh sieve, and then set the mesh sieve over a large bowl.

    Sprinkle the zucchini with salt, and stir or toss to mix the salt all through the grated veggies.

    Salt Zucchini in a Mesh Sieve.
    Salt Zucchini in a Mesh Sieve

    Let the zucchini rest for about five minutes, and then use your hands to squeeze as much liquid as possible out of the zucchini and into the bowl below.

    When you squeeze and not much liquid comes out, you're ready to move on. The zucchini will still look and feel damp, but it's released most of the liquid.

    Squeeze Zucchini + Drain Moisture Into Bowl.
    Squeeze Zucchini + Drain Moisture Into Bowl

    Move the zucchini onto a towel to dry.

    It won't get completely dry, but that's okay.

    Lay Squash on a Towel to Dry.
    Lay Squash on a Towel to Dry

    Reserve the zucchini liquid for later; don't discard it!

    If your zucchini didn't release much liquid, or if you accidentally throw out this liquid, I'll have tips for you later. Keep reading.

    Leftover Zucchini Liquid.
    Leftover Zucchini Liquid

    Preparing the Rice

    Next, you're going to parboil rice.

    Bring a medium pot of water to a boil, and add white or jasmine rice. Don't use quick-cook rice, because it will turn to mush.

    When you add the rice to the pot, set a timer for five minutes.

    After four minutes, begin ladling some of the starchy rice water out of the pot and into the zucchini liquid. Keep going until you have two cups of liquid.

    After five minutes, strain out the rice and discard the remaining rice water.

    Par-Boil Rice.
    Parboil Rice

    Can I Swap the Rice for Cauliflower Rice?

    No, and don't skip the rice altogether either.

    In this recipe, rice does something really important. The rice absorbs all the liquid you'll be pouring into the gratin.

    Cauliflower rice won't absorb liquid, it will add more liquid. I love cauliflower rice, but do not use it in this recipe.

    Zucchini + Rice Water Substitutions

    If your zucchini were a little bit old, they might not have as much liquid to release. What should you do then?

    What happens if you accidentally strain the rice without saving rice water?

    Do not panic: you have options!

    For this recipe, you simply need two cups of flavorful liquid. If you don't want to (or can't) use zucchini juices and rice water, you can swap equal amounts of warm milk or broth.

    Can I Use Pre-Cooked, Leftover Rice?

    For the best texture, I recommend cooking the rice as directed in the recipe.

    If your rice is completely cooked before making the gratin, you risk over-cooked, mushy rice.

    That said, if you want to experiment with pre-cooked rice, I recommend sticking to sturdier rice (like brown rice). Keep in mind that you'll need to use one of the rice-water liquid substitutions listed above.

    What Size Pan Should I Use?

    Start with a large, oven-safe pan. I used my Lodge 12" carbon steel skillet.

    Do not use a smaller pan, the gratin ingredients will not fit.

    If you don't have an oven-safe pan large enough, use whatever large pan you have, and transfer the gratin ingredients to a casserole dish before baking.

    How to Make Zucchini Rice Gratin

    Once your zucchini is salted and dried, your rice is parboiled, and you have two cups of liquid ready, it's time to move on.

    Begin by cooking a diced onion until it begins to brown.

    Cook Onion in a Large Pan.
    Cook Onion in a Large Pan

    Next, add the grated zucchini.

    Cook it for a few minutes, or until the zucchini becomes tender.

    Add Zucchini + Garlic.
    Add Zucchini + Garlic

    Add some flour to the pan, and stir to combine. All-purpose gluten-free flour (such as Cup 4 Cup) will work perfectly here.

    The zucchini mixture will quickly begin to thicken. Make sure all the flour has been incorporated before moving onto the next step.

    Toss with Flour.
    Toss with Flour

    Next, begin slowly pouring the warm liquid into the pan. Stir as you pour, and continue adding until you've added all two cups.

    Bring the liquid to a simmer.

    Add Squash Liquid to Pan.
    Add Squash Liquid to Pan

    Next, stir in the rice.

    Add most of the cheese.

    Stir in Rice to make zucchini gratin.
    Stir in Rice
    Stir in Cheese to make zucchini rice gratin.
    Stir in Cheese

    If needed, you can stop at this point and hold the gratin in the fridge for up to a day.

    This zucchini rice gratin tastes best right after baking.

    If you plan on moving the gratin to the fridge, I suggest using a larger pan than I did to avoid spills in the fridge, or transfer it to an easier-to-store lidded casserole dish.

    Just before baking, sprinkle the remaining cheese on top.

    Slide the gratin into the oven and bake for about 30 minutes, or until the top is golden.

    Serve this gratin along with some baked tomatoes, pan-seared halibut, and a glass of crisp hard cider.

    zucchini rice gratin (tian de courgettes au riz) after baking.
    Bake Until Golden
    zucchini rice gratin (tian de courgettes au riz) scooped onto a plate
    Print Recipe Save Recipe Saved!
    5 from 6 votes

    Zucchini Rice Gratin

    This French zucchini rice gratin is based on Julia Child's tian de courgettes au riz, and is a delicious side dish made with fresh summer squash, rice and cheese.
    Author: Sarah Trenalone
    Prep Time15 minutes mins
    Cook Time45 minutes mins
    Total Time1 hour hr
    Course: Side Dish
    Cuisine: French
    Diet: Gluten Free, Vegetarian
    Servings: 6 people
    Calories: 207kcal
    Freezer Friendly?
    No
    Will It Keep?
    No
    Prevent your screen from going dark

    Ingredients

    • 2 pounds zucchini or summer squash, ~4 medium or 6 small squash
    • 2 teaspoons sea salt
    • ½ cup white or jasmine rice (not quick-cook or instant)
    • 3 tablespoons olive oil (divided)
    • 1 onion, diced
    • 2 teaspoons garlic powder (or 2 garlic cloves, minced)
    • 2 tablespoons flour Use AP gluten-free flour if needed
    • 2 cups liquid (zucchini juices plus rice water) See Recipe Notes
    • ⅔ cup Parmesan, freshly grated (divided) Or substitute Swiss, Jarlsberg, or Smoked Gouda
    • 1 lemon, cut into wedges

    Instructions

    • Preheat oven to 425°F.
      Grate all of the zucchini. Use the large side of a box grater or finely chop in a food processor.
      Place the grated zucchini in a mesh sieve, and then set the sieve on top of a large bowl. Stir the salt into the zucchini, and let it rest about 4-5 minutes. As it rests, the zucchini will start to sweat, releasing liquid into the bowl below.
      Salt Zucchini in a Mesh Sieve
    • Squeeze the zucchini to release the rest of the liquid. The zucchini will still feel damp to the touch, but most of the liquid has been released. Reserve the liquid.
      Squeeze Zucchini + Drain Moisture Into Bowl
    • Lay the grated zucchini out on a towel to dry.
      Lay Squash on a Towel to Dry
    • Bring a medium pot of water to a boil. Add the rice, and cook for exactly 5 minutes.
      After 4 minutes, begin ladling water out of the pot and into the bowl with the zucchini juice until you have a total of 2 cups of liquid. It's okay if you get a little bit of rice mixed in with the liquid.
      After 5 minutes, strain the rice and discard the remaining liquid.
      Par-Boil Rice
    • Heat 2 TB oil over medium heat in a large, oven-safe pan (like cast iron or carbon steel).
      Add the diced onion to the pan, and cook about 3-4 minutes, until the onions begin to brown.
      Cook Onion in a Large Pan
    • Add the zucchini and garlic to the pan with the onions. Cook 3-4 minutes, until the zucchini is tender.
      Add Zucchini + Garlic
    • Add the flour to the zucchini mixture, and stir. Cook about 2 minutes until the flour is incorporated. Stir well and make sure there are no lumps of uncooked flour before proceeding.
      Toss with Flour
    • Slowly pour the warm zucchini + rice water mixture into the pot, stirring as you pour. Continue cooking until the liquid begins to simmer.
      Add Squash Liquid to Pan
    • Stir in the rice and ½ cup of the cheese. Sprinkle the remaining cheese across the top of the zucchini mixture, and drizzle with the remaining 1 TB oil.
      Make Ahead Tip: If desired, you can stop at this point and finish cooking later. Make up to one day ahead, and then reheat to a simmer before proceeding to the next step.
      Stir in Cheese
    • Carefully move the pan into the oven. (It will be very full at this point!)
      Bake about 30 minutes, until the cheesy top has browned and the rice has absorbed the liquid.
      Squeeze a little fresh lemon juice over the vegetables just before serving. Serve immediately.
      Bake Until Golden

    Notes

    Gratin liquid options: As written, this recipe uses the zucchini juices plus starchy rice water.  If desired, you can swap the liquid for warmed milk or broth.

    Nutrition

    Calories: 207kcal (10%) | Carbohydrates: 22g (7%) | Protein: 8g (16%) | Fat: 11g (17%) | Saturated Fat: 3g (19%) | Cholesterol: 8mg (3%) | Sodium: 968mg (42%) | Potassium: 461mg (13%) | Fiber: 2g (8%) | Sugar: 5g (6%) | Vitamin A: 389IU (8%) | Vitamin C: 28mg (34%) | Calcium: 164mg (16%) | Iron: 1mg (6%)
    Tried this recipe?Leave a comment and rating below!

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    About Sarah Trenalone

    Sarah is the primary creator at Champagne Tastes. She's a photographer, food writer and traveler, and is certified in Backcountry Kitchen and Backcountry Navigation from the Colorado Outward Bound School and Identifying Wild Plants from Backpacker.

    5 from 6 votes (3 ratings without comment)

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    Comments

    All commentsI made thisQuestions
    1. Cindy says

      August 04, 2020 at 7:26 pm

      5 stars
      I made this using yellow squash. It was amazing: the instructions were well explained and easy to follow, the taste was an unexpected burst of yumminess in each bite, and this will be made again and again.

      Thank you for developing this recipe and sharing for others to try.

      Reply
      • Sarah Trenalone says

        August 04, 2020 at 8:23 pm

        I'm so happy that you loved it Cindy! Thanks for letting me know!!

        Reply
    2. Melanie SD says

      July 27, 2021 at 8:44 pm

      5 stars
      This was fabulous! I had a bunch of overgrown zucchini and needed something that I could do to use them. I peeled and seeded a giant zucchini, shredded it in the food processor, then chopped it more using the chopping blade. No need to drain or dry it since the moisture was already low. Used a large ovenproof saute pan and parmiggiano reggiano. The only thing I'd consider changing is possibly a bit less salt since it wasn't needed to drain the zucchini and the parmesan was fairly salty already. We loved it as is, but we love salty food.

      Reply
      • Alisha Trenalone says

        July 28, 2021 at 10:02 am

        Hi Melanie! 🙂 Good to hear from you. Yup, zucchini can really get massive this time of year, so glad you liked the zucchini rice gratin! Thanks for letting us know.

        -Alisha at Champagne Tastes

        Reply
    3. Karen says

      August 04, 2022 at 11:45 am

      For zucchini rice gratin, does it work with brown rice also ?

      Reply
      • Alisha Trenalone says

        August 04, 2022 at 2:16 pm

        Hi Karen! We've only tested this with white and jasmine rice, but pre-cooked brown rice should work (you'll just need to follow the liquid options notes for adding in some extra broth or milk). If it's uncooked brown rice, you'd probably need to parboil it until it has about 10 minutes left, based on whatever the packaging tells you about cook time. And then it should work to add it in to the zucchini and go from there.
        But again, we haven't tested it this way. If you try it, let us know how it goes!

        -Alisha at Champagne Tastes

        Reply
    4. Valerie says

      August 25, 2024 at 7:32 pm

      5 stars
      Used a zucchini from my garden. Added s little extra cheese on top😉
      Baked in a casserole dish as I don’t have an oven safe frying pan. We loved it!

      Reply
      • Alisha Trenalone says

        August 26, 2024 at 1:24 pm

        Awesome! So glad you enjoyed 😀

        -Alisha at Champagne Tastes

        Reply
    bio

    Hi, I'm Sarah! I'm a traveler who loves to eat.   Follow along to join me on my next adventure-- in food or on the road.

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