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Need a sensational vegetarian main dish? This galette with buttery pastry filled with roasted summer vegetables and a mustard cheese sauce is just the thing. Most of the time is hands off, while dough chills or tomatoes roast, and the dough and the sauce can be made ahead if you prefer.

Martha Stewart Living, July/August 2019

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Credit: Dana Gallagher

Recipe Summary

prep:
45 mins
total:
3 hrs
Yield:
Serves 6 to 8
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Ingredients

Ingredient Checklist

Directions

Instructions Checklist
  • Preheat oven to 375 degrees. Arrange tomatoes, cut-sides up, on a parchment-lined rimmed baking sheet; season with kosher salt. Roast until tomatoes shrink and collapse slightly, about 1 hour. Let cool completely.

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  • Meanwhile, pulse 1 3/4 cups flour, sugar, 3/4 teaspoon kosher salt, and 1/4 teaspoon pepper in a food processor until combined. Add cubed butter, Parmigiano-Reggiano, and 1/2 cup Gruyère; pulse until mixture resembles coarse meal, about 10 seconds. Drizzle 3 tablespoons ice-cold water evenly over mixture; pulse until it holds together when pressed between your fingers. (Dough should not be wet or sticky; if too dry, pulse in more water, 1 tablespoon at a time.) Shape into a disk, wrap in plastic, and refrigerate until firm, about 1 hour.

  • Melt remaining 2 tablespoons butter in a saucepan over medium heat; bring to a simmer. Add garlic and thyme; cook until fragrant, about 1 minute. Stir in remaining 1 tablespoon flour; cook until nutty and golden, about 2 minutes more. Add milk, return to a simmer, and cook, stirring occasionally, until reduced and thickened slightly, about 5 minutes. Remove from heat. Add remaining 3/4 cup Gruyère and mustard; whisk until smooth. Stir in 1/2 teaspoon kosher salt and 1/4 teaspoon pepper. Let cool completely, about 30 minutes.

  • On a lightly floured sheet of parchment, roll out dough to a 14-inch round. Spread cheese sauce evenly over dough, leaving a 2-inch border. Scatter half of corn evenly over sauce, then scatter zucchini evenly over corn. Top with roasted tomatoes, cut-sides up, and sprinkle with remaining corn. Season with flaky salt and pepper. Fold edges of dough up over vegetables, then brush dough with beaten egg. Transfer galette on parchment to a baking sheet.

  • Bake until crust is golden brown and set on bottom, and vegetables are tender and golden brown in places, 1 hour, 10 minutes to 1 hour, 20 minutes (if crust is browning too quickly, tent with foil). Transfer on parchment to a wire rack. Let cool until warm but no longer hot (about 30 minutes), or completely, before slicing and serving.

Cook's Notes

The dough can be refrigerated for up to two days, or frozen for up to a month; thaw it in the refrigerator before using. The cheese sauce can be made ahead and refrigerated in an airtight container for up to three days (if it's too stiff to spread easily, rewarm it slightly before using).

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