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  • Writer's pictureSarah Hiers

Summer Squash Gratin

Updated: May 4, 2021

When I first saw the photo of this dish in Food and Wine Magazine I was in awe. It was visually stunning, intricate and seemingly time consuming and complicated. I had to try it!

Thank goodness for the invention of the mandolin. That little device made quick work of the slicing and putting the flower together not as complicated. The dish is fantastic and, if you are into crusty bread, which we are not, you will love dipping it into the juices.

Bright, fresh summer squash
Oven Ready Summer Squash Gratine
Finished product - pretty and delicious


  • 1/4 cup extra-virgin olive oil

  • 3 small leeks (1/2 pound), white and tender green parts thinly sliced into rounds

  • 1/4 cup dry white wine

  • 3 medium zucchini, cut lengthwise into 1/8-inch-thick slices, preferably on a mandolin

  • 3 medium yellow summer squash, cut lengthwise into 1/8-inch-thick slices, preferably on a mandoline

  • Kosher salt

  • Pepper

  • 1 cup finely shredded Gruyère (about 2 ounces)

  • 1 plum tomato, very thinly sliced crosswise

  • Flaky sea salt and crusty bread, for serving


  1. Preheat the oven to 425°. In a large skillet, heat 1 tablespoon of oil over moderately high heat. Add the leeks and cook, stirring occasionally, until softened, about 3 minutes. Add the wine and cook until evaporated, about 2 minutes. Spread in a 9-inch round baking dish

  2. Meanwhile, on 2 large baking sheets, spread the zucchini and yellow squash and brush with the remaining 3 tablespoons of oil; season with salt and pepper. Sprinkle with the cheese and let sit until slightly softened, about 5 minutes.

  3. Tightly roll 1 piece of zucchini and set it on the leeks in the center of the dish. Working outward from that center slice, continue rolling and coiling additional pieces of zucchini and yellow squash until you reach the edge of the baking dish. Season the tomato slices with salt and pepper, then tuck in intervals between the zucchini and squash. Scrape any cheese off of the baking sheets and sprinkle on top.

  4. Bake for 30 minutes, until the zucchini and squash are tender and browned in spots. Sprinkle with sea salt. Let cool slightly, then serve with crusty bread.

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