Crispy Mushroom Galette with Flaky Olive Oil Dough
Serves 6 as a snack, 4 as a main course
1¾ cups all-purpose flour (8 oz / 227g)
1 tablespoon sugar (0.46 oz / 13g)
1 teaspoon Diamond Crystal kosher salt (0.11 oz / 3g)
7 tablespoons extra-virgin olive oil (3.4 oz / 96g)
Mix the dry ingredients: In a medium bowl, whisk together the flour, sugar, salt, and baking powder to combine. Make a well in the center of the dry ingredients.
Work in the oil: Pour 6 tablespoons of the oil (2.9 oz / 83g) into the well and use a fork to incorporate some of the flour from around the sides of the bowl until you have shaggy pieces. Break up the pieces with your fingertips so they’re no larger than a pea.
Bring the dough together: Drizzle ¼ cup cold tap water (2 oz / 57g) into the bowl, stirring constantly with a fork, then switch back to your hands and knead the mixture inside the bowl until a dough comes together. Transfer the dough to a work surface, leaving any floury bits behind in the bowl, then add more water 1 teaspoon at a time to the bowl to bring the rest of the dough together; add it to the rest of the dough.
Knead and chill: Knead the dough a few times just until it’s smooth (you don’t want to work the dough too much, although the oil does help prevent gluten development, thus protecting it against toughness). Press the dough into a ½-inch-thick square, wrap it tightly in plastic, and refrigerate for 1 hour.
Roll in more oil to create flakiness: Roll out the dough between two large sheets of parchment paper, periodically peeling off and repositioning each piece of the parchment, one at a time, for wrinkle-free rolling, to a ⅛-inch-thick square. Remove the top sheet of parchment paper and brush the remaining 1 tablespoon oil across the surface of the dough. Starting at the side closest to you, fold up the dough into a flat, loose roll. Flatten the roll with the heel of your hand across the entire length. Roll out the dough into a rough rectangle that’s about ¼ inch thick, then bring the left and right sides of the dough inward to fold it in thirds (this step ensures lots of flaky layers). Wrap the dough in plastic, pressing out any air, and press down on the dough with the heel of your hand to flatten it into a ½-inch-thick disk. Refrigerate the dough until it’s relaxed, at least 30 minutes and up to 3 days. It’s now ready to use.
7 tablespoons extra-virgin olive oil (7 oz / 200g), plus more for assembling
2 large leeks (1 lb 8 oz / 680g), dark green tops discarded, white and light green stalks split lengthwise, rinsed, and chopped
1 tablespoon grainy Dijon mustard (0.63 oz / 18g)
Kosher salt and freshly ground black pepper
1 pound (454g) shiitake, cremini, oyster, and/or maitake mushrooms, sliced or torn into 1-inch pieces
5 garlic cloves, 4 smashed and peeled, 1 finely grated
2 fresh rosemary sprigs, plus 1 tablespoon coarsely chopped fresh rosemary leaves
All-purpose flour, for rolling out
2 tablespoons panko bread crumbs
2 teaspoons nutritional yeast
Preheat the oven and prepare the baking sheet: Arrange an oven rack in the center position and preheat the oven to 350°F. Line a rimmed baking sheet with parchment paper and set aside.
Make the melted leek base: In a medium skillet (preferably cast-iron), heat 2 tablespoons of the olive oil over medium heat until shimmering. Add the leeks and cook, stirring often, until softened and translucent, 5 to 8 minutes. Reduce the heat to low and continue to cook, stirring occasionally and adding a splash of water to the skillet as needed if the leeks are starting to brown, until they’re very tender and starting to break down, another 15 to 20 minutes. Remove the skillet from the heat and stir in the mustard. Season with salt and pepper. Scrape the mixture into a medium bowl and set aside to cool. Wipe out the skillet and set it back on the stove for the mushrooms.
Cook the mushrooms: Add 2 tablespoons of the olive oil to the same skillet and heat over high heat until shimmering. Add half of the mushrooms, 2 of the smashed garlic cloves, and 1 of the rosemary sprigs. Toss the mushrooms once just to coat in oil, then let them cook undisturbed until they’re browned in spots, about 3 minutes. Continue to cook, tossing occasionally, until the mushrooms are browned all over, have released their liquid, and are tender, 5 to 8 minutes longer. Season the mixture with salt and pepper. Scrape into a separate medium bowl and set the bowl aside to cool. Repeat the process in the same skillet with 2 more tablespoons of oil, the remaining mushrooms, 2 smashed garlic cloves, rosemary sprig, and more salt and pepper. Reserve the skillet again for toasting the panko.
Roll out the dough: Unwrap the dough, place it on a lightly floured surface, and lightly dust the top with more flour. Roll out the dough, dusting with more flour as needed to prevent sticking, into a round about 12 inches in diameter. If it starts to shrink back as you’re trying to roll it, cover the dough and let it rest on the surface for 10 minutes, then proceed.
Assemble the galette: Transfer the dough to the prepared baking sheet. Spread the cooled leek mixture across the surface of the dough, leaving a 1½-inch border all the way around. Scatter the cooked mushrooms and garlic (discard the rosemary) over the leeks.
Fold up the crust: Using the parchment paper to help you, fold the sides of the pastry up and over the mushrooms, leaving the center open and creating a series of evenly spaced pleats all the way around. Press firmly on the pleats to help the pastry adhere to itself, then brush the exterior of the pastry with more olive oil. Sprinkle more salt and pepper across the entire surface of the tart.
Bake the galette: Bake the galette until the pastry is golden brown and the tops of the mushrooms are crispy, 45 to 55 minutes.
Make the garlicky bread crumbs: While the galette is baking, heat the remaining 1 tablespoon oil in the skillet over medium heat. Add the panko, nutritional yeast, grated garlic, and rosemary leaves and cook, stirring constantly, until the panko is golden brown and the mixture is very fragrant, about 4 minutes. Remove the skillet from the heat, season the mixture with salt and pepper, and scrape it onto a paper towel–lined plate to cool.
Finish the galette and serve: Remove the galette from the oven and let it cool before topping with the garlicky panko and cutting into slices. Serve warm or at room temperature.
Recipe from Dessert Person by Claire Saffitz